Add initial README.

README.markdown

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+Pistol
+======
+
+_n. A small tool designed to reload your rack application._
+
+Get it!
+-------
+
+    $ gem install pistol
+
+Usage
+-----
+
+    # app.rb
+    require "sinatra/base"
+    require "pistol"
+
+    class App < Sinatra::Base
+      use Pistol, :files => Dir[__FILE__, "./app/**/*.rb"]
+    end
+
+    Dir["./app/**/*.rb"].each { |file| require file }
+
+### What this does:
+
+1. It marks `app.rb` as the main application file. It's assumed that app.rb
+   handles all the loading, boiler plate, etc.
+2. It reloads everything in `app/**/*.rb`. You can of course specify
+   other paths (e.g. `./config/*.rb`, `./lib/*.rb`).
+
+### Only in development?
+
+Sure. Simply change it to:
+
+    class App < Sinatra::Base
+      configure :development do
+        use Pistol, :files => Dir[__FILE__, "./app/**/*.rb"]
+      end
+    end