README: Add how to install/build

Author: methane

README.md

@@ -1,5 +1,4 @@
-mysqlclient
-===========
+# mysqlclient
 
 [![Build Status](https://secure.travis-ci.org/PyMySQL/mysqlclient-python.png)](http://travis-ci.org/PyMySQL/mysqlclient-python)
 
@@ -8,11 +7,29 @@ This is a fork of [MySQLdb1](https://github.com/farcepest/MySQLdb1).
 This project adds Python 3 support and bug fixes.
 I hope this fork is merged back to MySQLdb1 like distribute was merged back to setuptools.
 
-Prerequisites for Installing
-----------------------------
+## Install
+
+### Prerequisites
 
 You may need to install the Python and MySQL development headers and libraries like so:
 
 `sudo apt-get install python-dev libmysqlclient-dev`  # Debian / Ubuntu
 
 `sudo yum install python-devel mysql-devel`  # Red Hat / CentOS
+
+On Windows, there are binary wheel you can install without MySQLConnector/C or MSVC. 
+
+
+### Install from PyPI
+
+`pip install mysqlclient`
+
+NOTE: Wheels for Windows may be not released with source package. You should pin version
+in your `requirements.txt` to avoid trying install source newest pacakge.
+
+
+### Install from source
+
+1. Download source by `git clone` or [zipfile](https://github.com/PyMySQL/mysqlclient-python/archive/master.zip).
+2. Customize `site.cfg`
+3. `python setup.py install`