Commit signing off update.

Signed-off-by: muhammad adil ghaffar <[email protected]>

CONTRIBUTING.md

@@ -9,6 +9,7 @@ GitHub pull requests. Those guidelines are the same as the
 
 - [How to Contribute](#how-to-contribute)
    - [Certificate of Origin](#certificate-of-origin)
+      - [Git commit Sign-off](#git-commit-sign-off)
    - [Finding Things That Need Help](#finding-things-that-need-help)
    - [Versioning](#versioning)
       - [Codebase and Go Modules](#codebase-and-go-modules)
@@ -35,6 +36,25 @@ By contributing to this project you agree to the Developer Certificate of Origin
 statement that you, as a contributor, have the legal right to make the
 contribution. See the [DCO](DCO) file for details.
 
+### Git commit Sign-off
+
+Commit message should contain signed off section with full name and email. For example:
+
+ ```text
+  Signed-off-by: John Doe <[email protected]>
+ ```
+
+When making commits, include the `-s` flag and `Signed-off-by` section will be automatically
+added to your commit message. If you want GPG signing too, add the `-S` flag alongside `-s`.
+
+```bash
+  # Signing off commit
+  git commit -s
+
+  # Signing off commit and also additional signing with GPG
+  git commit -s -S
+```
+
 ## Finding Things That Need Help
 
 If you're new to the project and want to help, but don't know where to start, we