README.md in elf_ham-0.1.0 vs README.md in elf_ham-0.2.0

@@ -1,13 +1,67 @@
 # ElfHam 🧝🍖
 
 ElfHam is an extremely simple utility gem that's useful for transform CSVs.
 
-## Usage
+## tldr;
 
-```sh
-gem install elf_ham
+```ruby
+require "elf_ham"
+
+# Load your CSV:
+elf_ham = ElfHam.new(ARGF.read)
+
+# Filter rows:
+elf_ham.select { |row| row["header2"] != "b" }
+
+# Transform rows:
+elf_ham.transform do |row|
+  row["header3"] = "elfham"
+end
+
+# Print the result
+puts elf_ham.output
 ```
+
+## Instructions
+
+1. Install the gem:
+
+   ```sh
+   gem install elf_ham
+   ```
+
+2. Create a transformation script:
+
+   ```sh
+   echo '#!/usr/bin/env ruby
+
+   require "elf_ham"
+
+   puts ElfHam.new(ARGF.read).select do |row|
+     row["header2"] != "b"
+   end.transform do |row|
+     row["header3"] = "elfham"
+   end.output' > transform.rb
+   ```
+
+3. Make the script executable:
+
+   ```sh
+   chmod u+x transform.rb
+   ```
+
+4. Edit the script to your liking.
+
+5. Run it:
+
+   ```sh
+   transform.rb path/to/your.csv > transformed.csv
+
+   # or
+
+   cat path/to/your.csv | transform.rb > transformed.csv
+   ```
 
 ## Development
 
 After checking out the repo, run `bin/setup` to install dependencies. Then, run
 `rake spec` to run the tests. You can also run `bin/console` for an interactive