Update readme

README.md

@@ -1,9 +1,7 @@
-# Kramdown::Amp
+# Kramdown Converter for Amp
 
 Welcome to your new gem! In this directory, you'll find the files you need to be able to package up your Ruby library into a gem. Put your Ruby code in the file `lib/kramdown/amp`. To experiment with that code, run `bin/console` for an interactive prompt.
 
-TODO: Delete this and the text above, and describe your gem
-
 ## Installation
 
 Add this line to your application's Gemfile:
@@ -20,6 +18,14 @@ Or install it yourself as:
 
     $ gem install kramdown-amp
 
+## How it works
+
+kramdown-amp works by monkey-patching `Kramdown::Converter::Html`.
+
+## Supported amp tag
+
+- img -> amp-img
+
 ## Usage
 
 TODO: Write usage instructions here

kramdown-amp.gemspec

@@ -9,8 +9,8 @@ Gem::Specification.new do |spec|
   spec.authors       = ["toshimaru"]
   spec.email         = ["me@toshimaru.net"]
 
-  spec.summary       = %q{kramdown for AMP}
-  spec.description   = %q{kramdown for AMP}
+  spec.summary       = %q{Kramdown AMP Converter}
+  spec.description   = %q{Kramdown AMP Converter}
   spec.homepage      = "https://github.com/toshimaru/kramdown-amp"
   spec.license       = "MIT"