Add README and .gitignore

.gitignore

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+pkg/*
+*.gem
+.bundle

README.md

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+# AnsiArt
+
+This project is under refactoring.
+
+Pending issues:
+
+* Currently it only supports Ruby 1.9.2 or above because it uses `String#encode!`
+* It requires `uming.ttc` font file in current working directory. This is inconvenient.
+
+I saw there are some code to use `gd2` gem in ruby 1.8.x. I think that doesn't work.
+
+## Requirement
+
+* Ruby 1.9.2 or above
+* libgd
+
+## Installation
+
+It's not on rubygems.org yet. Just clone the git reposiory and execute.
+
+    rake install
+
+## Example: Get it working
+
+Put a `uming.tcc` font file in your working directory. 
+In Ubuntu it might be at `/usr/share/fonts/truetype/arphic/uming.ttc`.
+
+Download a ansi file:
+
+    wget http://ansi.loli.tw/ansiarts/static/803.ans
+
+And here is the ruby snippet:
+
+    require 'rubygems'
+    gem 'ansi_art'
+    require 'ansi_art'
+
+    c = AnsiArt::Document.new(IO.read('803.ans'))
+    html = c.to_html
+    File.open('out.html', 'w') { |f| f.write(html) }
+    png = c.to_png
+    File.open('out.png', 'wb') { |f| f.write(png) }
+
+You should see `out.html` and `out.png` in your working directory.
+