📝 Add CONTRIBUTING.md (#52)

Add contributing guidelines for future commit messages

CONTRIBUTING.md

@@ -0,0 +1,41 @@
+# Contributing to Okta Open Source Repos
+
+## Style
+
+### Git Commit Messages
+
+We use a simplified form of [Atom's](https://github.com/atom/atom/blob/master/CONTRIBUTING.md#git-commit-messages) commit convention.
+
+  * Use the present tense ("Adds feature" not "Added feature")
+  * Limit the first line to 72 characters or less
+  * Add one feature per commit. If you have multiple features, have multiple commits.
+
+#### Template
+
+    <emoji> Short Description of Commit
+    <BLANKLINE>
+    More detailed description of commit
+    <BLANKLINE>
+    Resolves: <Jira # or Issue #>
+
+#### Emoji Categories
+Our categories include:
+  * :seedling: `:seedling`: when creating a new feature
+  * :bug: `:bug:` when fixing a bug
+  * :white_check_mark: `:white_check_mark:` when adding tests
+  * :art: `:art:` when improving the format/structure of the code
+  * :memo: `:memo:` when writing docs
+  * :fire: `:fire:` when removing code or files
+  * :package: `:package` when pushing a new release
+  * :arrow_up: `:arrow_up:` when upgrading dependencies
+  * :arrow_down: `:arrow_down:` when downgrading dependencies
+
+If you do not see an exact emoji match, use the best matching emoji.
+
+#### Example
+    :memo: Updates CONTRIBUTING.md
+
+    Updates Contributing.md with new emoji categories
+    Updates Contributing.md with new template 
+
+    Resolves: OKTA-12345

README.md

@@ -6,6 +6,8 @@ Okta Auth JS is a wrapper around [Okta's authentication API](http://developer.ok
 
 If you want to use the SDK, see the instructions on [the Okta Auth SDK developer page](http://developer.okta.com/docs/guides/okta_auth_sdk.html).
 
+If you wish to contribute to okta-auth-js, please read the following [contributing guidelines](./CONTRIBUTING.md)
+
 If you want to modify the SDK, use the following instructions.
 
 ## Building the SDK