README.md in nano-bots-2.0.0 vs README.md in nano-bots-2.1.0

- old
+ new

@@ -34,17 +34,17 @@
 ## Setup
 
 For a system usage:
 
 ```sh
-gem install nano-bots -v 2.0.0
+gem install nano-bots -v 2.1.0
 ```
 
 To use it in a project, add it to your `Gemfile`:
 
 ```ruby
-gem 'nano-bots', '~> 2.0.0'
+gem 'nano-bots', '~> 2.1.0'
 ```
 
 ```sh
 bundle install
 ```
@@ -103,15 +103,14 @@
 
 # NANO_BOTS_STATE_DIRECTORY=/home/user/.local/state/nano-bots
 # NANO_BOTS_CARTRIDGES_DIRECTORY=/home/user/.local/share/nano-bots/cartridges
 ```
 
-#### Option 2: Service Account (Vertex AI API)
+#### Option 2: Service Account Credentials File (Vertex AI API)
 
 ```sh
 export GOOGLE_CREDENTIALS_FILE_PATH=google-credentials.json
-export GOOGLE_PROJECT_ID=your-project-id
 export GOOGLE_REGION=us-east4
 
 export NANO_BOTS_ENCRYPTION_PASSWORD=UNSAFE
 export NANO_BOTS_END_USER=your-user
 
@@ -121,20 +120,57 @@
 
 Alternatively, if your current directory has a `.env` file with the environment variables, they will be automatically loaded:
 
 ```sh
 GOOGLE_CREDENTIALS_FILE_PATH=google-credentials.json
-GOOGLE_PROJECT_ID=your-project-id
 GOOGLE_REGION=us-east4
 
 NANO_BOTS_ENCRYPTION_PASSWORD=UNSAFE
 NANO_BOTS_END_USER=your-user
 
 # NANO_BOTS_STATE_DIRECTORY=/home/user/.local/state/nano-bots
 # NANO_BOTS_CARTRIDGES_DIRECTORY=/home/user/.local/share/nano-bots/cartridges
 ```
 
+#### Option 3: Application Default Credentials (Vertex AI API)
+
+```sh
+export GOOGLE_REGION=us-east4
+
+export NANO_BOTS_ENCRYPTION_PASSWORD=UNSAFE
+export NANO_BOTS_END_USER=your-user
+
+# export NANO_BOTS_STATE_DIRECTORY=/home/user/.local/state/nano-bots
+# export NANO_BOTS_CARTRIDGES_DIRECTORY=/home/user/.local/share/nano-bots/cartridges
+```
+
+Alternatively, if your current directory has a `.env` file with the environment variables, they will be automatically loaded:
+
+```sh
+GOOGLE_REGION=us-east4
+
+NANO_BOTS_ENCRYPTION_PASSWORD=UNSAFE
+NANO_BOTS_END_USER=your-user
+
+# NANO_BOTS_STATE_DIRECTORY=/home/user/.local/state/nano-bots
+# NANO_BOTS_CARTRIDGES_DIRECTORY=/home/user/.local/share/nano-bots/cartridges
+```
+
+#### Custom Project ID
+
+If you need to manually set a Google Project ID:
+
+```sh
+export GOOGLE_PROJECT_ID=your-project-id
+```
+
+Alternatively, if your current directory has a `.env` file with the environment variables, they will be automatically loaded:
+
+```sh
+GOOGLE_PROJECT_ID=your-project-id
+```
+
 ## Docker
 
 Clone the repository and copy the Docker Compose template:
 
 ```
@@ -150,11 +186,11 @@
 ```yaml
 ---
 services:
   nano-bots:
     image: ruby:3.2.2-slim-bookworm
-    command: sh -c "apt-get update && apt-get install -y --no-install-recommends build-essential libffi-dev libsodium-dev lua5.4-dev curl && curl -s https://raw.githubusercontent.com/babashka/babashka/master/install | bash && gem install nano-bots -v 2.0.0 && bash"
+    command: sh -c "apt-get update && apt-get install -y --no-install-recommends build-essential libffi-dev libsodium-dev lua5.4-dev curl && curl -s https://raw.githubusercontent.com/babashka/babashka/master/install | bash && gem install nano-bots -v 2.1.0 && bash"
     environment:
       OPENAI_API_ADDRESS: https://api.openai.com
       OPENAI_API_KEY: your-access-token
       NANO_BOTS_ENCRYPTION_PASSWORD: UNSAFE
       NANO_BOTS_END_USER: your-user
@@ -170,40 +206,64 @@
 ```yaml
 ---
 services:
   nano-bots:
     image: ruby:3.2.2-slim-bookworm
-    command: sh -c "apt-get update && apt-get install -y --no-install-recommends build-essential libffi-dev libsodium-dev lua5.4-dev curl && curl -s https://raw.githubusercontent.com/babashka/babashka/master/install | bash && gem install nano-bots -v 2.0.0 && bash"
+    command: sh -c "apt-get update && apt-get install -y --no-install-recommends build-essential libffi-dev libsodium-dev lua5.4-dev curl && curl -s https://raw.githubusercontent.com/babashka/babashka/master/install | bash && gem install nano-bots -v 2.1.0 && bash"
     environment:
       GOOGLE_API_KEY: your-api-key
       NANO_BOTS_ENCRYPTION_PASSWORD: UNSAFE
       NANO_BOTS_END_USER: your-user
     volumes:
       - ./your-cartridges:/root/.local/share/nano-bots/cartridges
       - ./your-state-path:/root/.local/state/nano-bots
 ```
 
-#### Option 2: Service Account (Vertex AI API)
+#### Option 2: Service Account Credentials File (Vertex AI API)
 
 ```yaml
 ---
 services:
   nano-bots:
     image: ruby:3.2.2-slim-bookworm
-    command: sh -c "apt-get update && apt-get install -y --no-install-recommends build-essential libffi-dev libsodium-dev lua5.4-dev curl && curl -s https://raw.githubusercontent.com/babashka/babashka/master/install | bash && gem install nano-bots -v 2.0.0 && bash"
+    command: sh -c "apt-get update && apt-get install -y --no-install-recommends build-essential libffi-dev libsodium-dev lua5.4-dev curl && curl -s https://raw.githubusercontent.com/babashka/babashka/master/install | bash && gem install nano-bots -v 2.1.0 && bash"
     environment:
       GOOGLE_CREDENTIALS_FILE_PATH: /root/.config/google-credentials.json
-      GOOGLE_PROJECT_ID: your-project-id
       GOOGLE_REGION: us-east4
       NANO_BOTS_ENCRYPTION_PASSWORD: UNSAFE
       NANO_BOTS_END_USER: your-user
     volumes:
       - ./google-credentials.json:/root/.config/google-credentials.json
       - ./your-cartridges:/root/.local/share/nano-bots/cartridges
       - ./your-state-path:/root/.local/state/nano-bots
 ```
 
+#### Option 3: Application Default Credentials (Vertex AI API)
+
+```yaml
+---
+services:
+  nano-bots:
+    image: ruby:3.2.2-slim-bookworm
+    command: sh -c "apt-get update && apt-get install -y --no-install-recommends build-essential libffi-dev libsodium-dev lua5.4-dev curl && curl -s https://raw.githubusercontent.com/babashka/babashka/master/install | bash && gem install nano-bots -v 2.1.0 && bash"
+    environment:
+      GOOGLE_REGION: us-east4
+      NANO_BOTS_ENCRYPTION_PASSWORD: UNSAFE
+      NANO_BOTS_END_USER: your-user
+    volumes:
+      - ./your-cartridges:/root/.local/share/nano-bots/cartridges
+      - ./your-state-path:/root/.local/state/nano-bots
+```
+
+#### Custom Project ID
+If you need to manually set a Google Project ID:
+
+```yaml
+environment:
+  GOOGLE_PROJECT_ID=your-project-id
+```
+
 ### Container
 
 Enter the container:
 ```sh
 docker compose run nano-bots
@@ -414,11 +474,11 @@
     api-key: ENV/GOOGLE_API_KEY
   options:
     model: gemini-pro
 ```
 
-#### Option 2: Service Account (Vertex AI API)
+#### Option 2: Service Account Credentials File (Vertex AI API)
 
 ```yaml
 ---
 meta:
   symbol: 🤖
@@ -435,16 +495,52 @@
 provider:
   id: google
   credentials:
     service: vertex-ai-api
     file-path: ENV/GOOGLE_CREDENTIALS_FILE_PATH
-    project-id: ENV/GOOGLE_PROJECT_ID
     region: ENV/GOOGLE_REGION
   options:
     model: gemini-pro
 ```
 
+#### Option 3: Application Default Credentials (Vertex AI API)
+
+```yaml
+---
+meta:
+  symbol: 🤖
+  name: Nano Bot Name
+  author: Your Name
+  version: 1.0.0
+  license: CC0-1.0
+  description: A helpful assistant.
+
+behaviors:
+  interaction:
+    directive: You are a helpful assistant.
+
+provider:
+  id: google
+  credentials:
+    service: vertex-ai-api
+    region: ENV/GOOGLE_REGION
+  options:
+    model: gemini-pro
+```
+
+#### Custom Project ID
+
+If you need to manually set a Google Project ID:
+
+```yaml
+---
+provider:
+  id: google
+  credentials:
+    project-id: ENV/GOOGLE_PROJECT_ID
+```
+
 ### Tools (Functions)
 
 Nano Bots can also be powered by _Tools_ (Functions):
 
 ```yaml
@@ -647,7 +743,7 @@
 ```bash
 gem build nano-bots.gemspec
 
 gem signin
 
-gem push nano-bots-2.0.0.gem
+gem push nano-bots-2.1.0.gem
 ```