[ci skip] Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -16,4 +16,32 @@ Bugs are reported and tracked at simcaq/SCRUM repository. As you determinate whi
 * **master**: protected branch and contains the stable version
 * **development**: default branch
 * **issue/??**: issue branch - a branch created to solve a issue
-* **feature_????**: feature branch - a branch created to add a feature
\ No newline at end of file
+* **feature_????**: feature branch - a branch created to add a feature
+
+## Styleguide
+
+### Commit messages
+
+* Use the present tense ("Add feature" not "Added feature")
+* Use the imperative mood ("Move cursor to..." not "Moves cursor to...")
+* Limit the first line to 72 characters or less
+* Reference issues and pull requests liberally
+* When only changing documentation, include [ci skip] in the commit description
+* Consider starting the commit message with an applicable emoji:
+  * :art: `:art:` when improving the format/structure of the code
+  * :racehorse: `:racehorse:` when improving performance
+  * :memo: `:memo:` when writing docs
+  * :bug: `:bug:` when fixing a bug
+  * :fire: `:fire:` when removing code or files
+  * :green_heart: `:green_heart:` when fixing the CI build
+  * :white_check_mark: `:white_check_mark:` when adding tests
+  * :lock: `:lock:` when dealing with security
+  * :arrow_up: `:arrow_up:` when upgrading dependencies
+  * :arrow_down: `arrow_down` when downgrading dependencies
+
+### JavaScript Styleguide
+
+All JavaScript follows the AirBnB styleguide with the following modifications:
+* 4 spaces of identation
+* No unused vars
+* Allow param reassign