Introduction of Pull Request templates (eclipse-kapua#1728)

Introduction of Pull Request templates

Signed-off-by: coduz <[email protected]>

PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,16 @@
+Brief description of the PR.
+[e.g. Added `null` check on `object` to avoid `NullPointerException`]
+
+**Related Issue**
+This PR fixes/closes _{issue number}_
+
+**Description of the solution adopted**
+A more detailed description of the changes made to solve/close one or more issues.
+If the PR is simple and easy to inderstand this section can be skipped.
+
+**Screenshots**
+If applicable, add screenshots to help explain your solution
+
+**Any side note on the changes made**
+Description of any other change that has been made, which is not directly linked to the issue resolution
+[e.g. Code clean up/Sonar issue resolution]