README.md in capistrano-nginx-unit-0.1 vs README.md in capistrano-nginx-unit-0.2

@@ -1,9 +1,47 @@
 # capistrano-nginx-unit
 
 ## Installation
 
-TODO: writing
+```rb
+gem "capistrano-nginx-unit"
+```
 
 ## Usage
 
-TODO: writing
+Require in Capfile.
+
+```rb
+# Capfile
+require "capistrano/nginx-unit"
+```
+
+Defined following tasks.
+
+```
+cap nginx_unit:configure           # Set listener and application configuration for NGINX Unit
+cap nginx_unit:configure_app       # Set application configuration for NGINX Unit
+cap nginx_unit:configure_listener  # Set listener configuration for NGINX Unit
+cap nginx_unit:start               # Start NGINX Unit process
+```
+
+Defined following customizable options.
+
+```rb
+set :nginx_unit_roles,        -> { :app }
+set :nginx_unit_pid,          -> { "/var/run/unit.pid" }
+set :nginx_unit_control_sock, -> { "/var/run/control.unit.sock" }
+set :nginx_unit_options,      -> { "" }
+set :nginx_unit_listen,       -> { "*:3000" }
+set :nginx_unit_app_name,     -> { fetch(:application) }
+set :nginx_unit_processes,    -> { 1 }
+set :nginx_unit_user,         -> { nil }
+set :nginx_unit_group,        -> { nil }
+set :nginx_unit_script,       -> { "config.ru" }
+```
+
+If you want to apply new code when deployed, please invoke `nginx_unit:configure` task after `deploy:published`.
+
+```rb
+# deploy.rb
+after "deploy:published", "nginx_unit:configure"
+```