Add Github action that verify commit message prefix

If the PR is related to some role, it would verify if in the title or
commit message header there is prefix set.
For example, if change was done for roles/cifmw_helpers, it should
verify if the title or commit message header contains [cifmw_helpers].

Co-Authored-By: Szymon Datko <[email protected]>
Signed-off-by: Daniel Pawlik <[email protected]>

Author: danpawlik

CONTRIBUTING.md

@@ -45,6 +45,19 @@ Here is an example, based on a common use-case, on how to use those variables
     oc get openstackdataplane -n {{ cifmw_install_yamls_defaults['NAMESPACE'] }}
 ~~~
 
+## A few words about using Git
+
+Before you make a pull request, make sure that:
+
+* the title of your git commit message begins with the role
+  name in brackets: `[my_wonderful_role]` or `(my_wonderful_role)`
+* the git commit body message is longer than 10 characters and describes
+  the reason why you added this change
+* sign your git commit using the `Signed-Off-By` option by
+  adding: `--signoff` or `-s` when using the command: `git commit`.
+* if you already make a commit, and you want to add `Signed-Off-By`,
+  use command: `git commit --amend --signoff`
+
 ### Documentation
 
 A new role must get proper documentation. Please edit the README.md located in