Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -22,4 +22,13 @@ If the branch to be created is linked to an issue, then the name of the branch m
 
 ## CHANGLOG
 
-When you have finished working, you must fill in the changelog with the current date. The changelog should list the main changes and anything else you think is relevant.
+When you have finished working, you must fill in the changelog with the current date. The changelog should list the main changes and anything else you think is relevant.
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+
+## Issues
+
+When you create a new issue, please add the right labels.
+
+* `Back-end`      If this is about the back-end
+* `Front-end`     If this is about the front-end
+* `Documentation` If this is about the documentation
+* `Bug`           If this is a bug or any trouble
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