Add short presentation to README

README.rst

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+=========
+Powerline
+=========
+
+:Author: Kim Silkebækken (kim.silkebaekken+vim@gmail.com)
+:Source: https://github.com/Lokaltog/powerline
+
+**This is alpha software, expect things to change or break at any point.**
+
+This is the next version of Powerline, implemented in Python. It aims to 
+resolve some of the "unresolvable" problems of the vimscript implementation, 
+as well as providing a common code base for all projects that use Powerline 
+in some way (e.g. shell prompts and tmux themes).
+
+Some of the new features for vim are:
+
+* **Dynamic statusline evaluation in Python.** Python performs really well 
+  and allows Powerline to re-render the statusline in Python instead of 
+  relying on vim's statusline flags. This means no more caching, and much 
+  more flexibility.
+* **Automatic removal of less important segments in small windows.** Not all 
+  information is equally important to have in the statusline, and segments 
+  with e.g. encoding and file format information are automatically removed 
+  in smaller windows.
+* **The possibility of adding more segments.** Because of vim's hardcoded 
+  limitation of 80 statusline options, the vimscript implementation 
+  triggered an error when adding more segments to the default theme. Since 
+  segment contents are now rendered as plain text in Python it's possible to 
+  add many more segments in the statusline before hitting this limit.