Add a contributing doc

CONTRIBUTING.rst

@@ -0,0 +1,39 @@
+For more information, please see the official docs at
+http://boto3.readthedocs.org/
+
+Contributing Code
+-----------------
+A good pull request:
+
+-  Is clear.
+-  Works across all supported versions of Python.
+-  Follows the existing style of the code base (PEP-8).
+-  Has comments included as needed.
+
+-  A test case that demonstrates the previous flaw that now passes with
+   the included patch, or demonstrates the newly added feature.
+-  If it adds/changes a public API, it must also include documentation
+   for those changes.
+-  Must be appropriately licensed (Apache 2.0).
+
+Reporting An Issue/Feature
+--------------------------
+First, check to see if there's an existing issue/pull request for the
+bug/feature. All issues are at
+https://github.com/boto/boto3/issues and pull reqs are at
+https://github.com/boto/boto3/pulls.
+
+If there isn't an existing issue there, please file an issue. The
+ideal report includes:
+
+-  A description of the problem/suggestion.
+-  How to recreate the bug.
+-  If relevant, including the versions of your:
+
+   -  Python interpreter
+   -  Boto 3
+   -  Optionally of the other dependencies involved (e.g. Botocore)
+
+-  If possible, create a pull request with a (failing) test case
+   demonstrating what's wrong. This makes the process for fixing bugs
+   quicker & gets issues resolved sooner.

MANIFEST.in

@@ -1,3 +1,4 @@
+include CONTRIBUTING.rst
 include README.rst
 include LICENSE
 include requirements.txt