Add CONTRIBUTING.md.

CONTRIBUTING.md

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+# Guidelines for Contributing
+
+## Issue Filing
+
+0. Please do not create issues for questions you have. The appropriate location
+   for such questions is [/r/redditdev](https://www.reddit.com/r/redditdev/).
+
+0. Please check the
+   [Unreleased](https://github.com/praw-dev/praw/blob/master/CHANGES.rst#unreleased)
+   section of the latest changelog before filing an issue as it's possible the
+   issue has already been resolved.
+
+0. Please use GitHub's search feature to look for already reported issues
+   before reporting your own.
+
+## Pull Request Creation
+
+0. If you are fixing an already filed issue, please indicate your intentions by
+   commenting on the issue. This act will hopefully minimize any duplicate
+   work.
+
+0. Prior to creating a pull request run the `lint.sh` script. This script
+   depends on the tools `flake8`, `pylint`, and `pep257`. They can be installed
+   via `pip install flake8 pylint pep257.
+
+0. Once pushed, ensure that your TravisCI build succeeds. Travis will error
+   before running any tests if there are _any_ `flake8` or `pep257`
+   errors. Resolve any issues by updating your pull request. _Note_: Some tests
+   are simply flakey and may not pass for you. If you suspect that is the case
+   please add a comment to the pull request indicating your suspicion.
+
+0. Feel free to check on the status of your pull request periodically by adding
+   a comment.
+
+## Becoming a Maintainer
+
+PRAW is looking for one or two people to regularly handle issues, and integrate
+others' pull requests. Interested parties should make their intentions known by
+resolving a few issues via pull requests.
+
+---
+
+Some contents of this file were adapted from github3.py
+[CONTRIBUTING.rst](https://github.com/sigmavirus24/github3.py/blob/master/CONTRIBUTING.rst).