Merge pull request #112 from netguru/contributing-guidelines-update

docs: updated contributing guidelines

Author: pwysowski

docs/CONTRIBUTING.md

@@ -21,6 +21,7 @@ $ yarn test
 * adding video or screenshot is very beneficial but it's not mandatory
 * additionally please remember to add appropriate Pull Request title from following:
   * `[RNS-XX] short description` - for normal feature branches
+* remember one pull request should always address one issue or feature
 
 ## Code structure
 ```
@@ -36,3 +37,4 @@ src/
 * Name branch according to your ticket following this pattern: RNS-XX-short_description
 * Imports and exports inside `index.js` files eg. `screens/index.js`, `components/index.js` should be alfabetically
 * Style names in `ComponentName.styles.js` should be ordered alfabetically
+* Please use commit lint and follow commit naming convention (https://www.conventionalcommits.org/en/v1.0.0/)