Create CONTRIBUTING.md

CONTRIBUTING.md

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+All commits should have one of the following prefixes: REL, FIX, ADD, TST, OPS, DOC. For example `"ADD: new feature"`.
+
+Commits should be atomic: one commit - one feature, one commit - one bugfix etc.
+
+When you tag a new release, use the following example:
+`git tag -m "REL v1.4.0: 157c9c2" v1.4.0`
+You may get the commit hash from git log. Don't forget to push tags `git push origin --tags`
+
+When tagging a new release, make sure to increment version in package.json and other files (we have a script for that: `./edit-version-number.sh`)  
+In the commit where you up version you can have the commit message as
+`"REL vX.X.X: Summary message"`.