Added a README file.

README

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+<!--*-markdown-*-->
+
+# `cssmin`
+
+This is a Python port of the [YUI CSS Compressor][yuicompressor]. Install it:
+
+  [yuicompressor]: http://developer.yahoo.com/yui/compressor/
+
+    $ easy_install cssmin # OR
+    $ pip install cssmin
+
+Use it from the command-line:
+
+    $ cssmin --help
+    $ cat file1.css file2.css file3.css | cssmin > output.min.css
+    $ cssmin --wrap 1000 < input.css > output.css
+
+Or use it from Python:
+
+    >>> import cssmin
+    >>> output = cssmin.cssmin(open('input.css').read())
+    >>> print output