Bump version and add plugin contribution guidelines.

CONTRIBUTING.md

@@ -0,0 +1,21 @@
+# Contributing to `tb2k`
+
+`tb2k` keeps plugins in the [`topics.functions`][topic functions] module. If
+you'd like to contribute a topic source of your own you can submit a pull
+request to this repository adding a function to that module. Topic functions
+**MUST** conform to the following specification:
+
+1. Begin with the `topic_` prefix.
+2. Take no arguments.
+3. Return a `topic` string and a `link` string as a tuple.
+  - The `link` _can_ be the empty string.
+
+An example topic function might look like this:
+```python
+def topic_wwucs():
+    topic = 'WWU CS rules!'
+    link = 'https://wwucs.slack.com'
+    return topic, link
+```
+
+[topic functions]: https://github.com/solus-impar/tb2k/blob/master/topics/functions.py

README.md

@@ -29,9 +29,15 @@ to one of thse pages.
 * Thursday & Friday: Random programming language
 * Saturday & Sunday: Top HN story
 
+## New Topics
+Don't like the topics that `tb2k` currently supports? Follow the
+[contribution guidelines] to add one!
+
+## Resources
 Slack API: [api.slack.com](https://api.slack.com/)
 
 You should also check out [wb2k].
 
 [wb2k]: https://www.github.com/reillysiemens/wb2k/
 [virtualenv]: https://virtualenv.pypa.io/en/stable/
+[contribution guidelines]: https://github.com/solus-impar/tb2k/blob/master/CONTRIBUTING.md

setup.py

@@ -10,7 +10,7 @@
 
 setup(
     name='tb2k',
-    version='0.2.0',
+    version='0.3.0',
     description='A python3 slack topic bot.',
     author='Mike Canoy',
     author_email='canoym@students.wwu.edu',