Add missing module docstrings

Signed-off-by: Stephen Finucane <[email protected]>

Author: stephenfin

git_pw/__init__.py

@@ -1,3 +1,8 @@
+"""
+git-pw -- A tool for integrating Git with Patchwork, the web-based patch
+tracking system.
+"""
+
 import pkg_resources
 
 __version__ = pkg_resources.get_distribution('git-pw').version

git_pw/shell.py

@@ -1,5 +1,5 @@
 """
-TODO.
+Command-line interface to the Patchwork API.
 """
 
 import click