Contribution.md updated using script.

Refer to the script:
https://booting.oniroproject.org/distro/docs/-/tree/main/contributing
https://booting.oniroproject.org/distro/docs/-/blob/main/contributing


/CONTRIBUTING.sh

Instructions:

At terminal, navigate to the repository root & generate it by executing:

`$contributing/CONTRIBUTING.sh -o ./CONTRIBUTING.md`

Signed-off-by: NawabAhmad <nawab.ahmad.reshi@huawei.com>


(cherry picked from commit 373ca3f2369c58e65a9e290d4cebe4bd71a566bd)