added contributing guidelines

- includes a pull request template

.github/CONTRIBUTING.md

@@ -0,0 +1,27 @@
+# Ex-Mode Contributing Guidelines
+
+Current Maintainers:
+
+- [@jazzpi](https://github.com/jazzpi)
+- [@LongLiveCHIEF](https://github.com/LongLiveCHIEF)
+
+This project is accepting new maintainers. Interested parties should 
+
+1. Open a new issue, titled: `New Maintainer Request`
+2. Assign the issue to [@lloeki](https://github.com/lloeki)
+3. The last line of your request should `/cc @jazzpi @LongLiveCHIEF`
+
+## Pull Requests
+
+- If the PR *fixes* or should result in the closure of any issues, use the `fixes #` or `closes #` syntax to ensure issue will 
+close when your PR is merged
+- All pull-requests that fix a bug, or add a new feature, *must* have accompanying tests
+- Please use the [pull request template](PULL_REQUEST_TEMPLATE.md) as a guide for submitting your PR.
+- Include a `/cc` for @LongLiveCHIEF and @jazzpi, the current maintainers
+
+## Issues
+
+- Be aware of the responsibilities of `ex-mode` vs `vim-mode`
+- If you have identified a bug, we would welcome any Pull Requests that either:
+ - Fix the issue
+ - Create failing tests to confirm the bug