gitignore and doc update

Author: ymattw

.gitignore

@@ -0,0 +1,2 @@
+*.pyc
+*~

README.md

@@ -1,12 +1,12 @@
 ## About
 
-View **colored** diff in unified-diff format or **side-by-side** with **auto
-pager**.  Requires Python (>= 2.5.0) and `less`.
+View **colored** diff in unified-diff format or **side-by-side** mode with
+**auto pager**.  Requires Python (>= 2.5.0) and `less`.
 
 ![Default](img/default.png)
 ![Side-by-side](img/side-by-side.png)
 
-## Install
+## Installation
 
 Save [src/cdiff.py](https://raw.github.com/ymattw/cdiff/master/src/cdiff.py) to
 whatever directory which is in your `$PATH`, for example, `$HOME/bin` is in my

src/cdiff.py

@@ -1,6 +1,13 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
+"""
+View colored diff in unified-diff format or side-by-side mode with auto pager.
+Requires Python (>= 2.5.0) and less.
+
+See demo at homepage: https://github.com/ymattw/cdiff
+"""
+
 import sys
 import os
 import re