Create CONTRIBUTING.md

Author: kandarpamalipeddi

CONTRIBUTING.md

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+## A special note to contributors
+
+Please follow the below rules while contributing your build script to this repo.
+
+1. Please mention in notes that, whether the script is made for root user or non-root user.
+2. Always keep the package version/commitID in variable. Try to take version as parameter otherwise take a default version number you are working on. Below is the example:
+	``` shell
+	VERSION=${1:-v5.0.2}
+	# v5.0.2 is the default version, in case of no parameter passed to the script.
+	```
+3. Always create a directory for each new package/component and place [LICENSE](https://github.com/ppc64le/build-scripts/blob/master/LICENSE) file into it.
+4. Package name & Filenames must be in **lowercase**.
+5. Get Legal approvals incase of any code change/patch. 
+6. Build script templates can be found [here](https://github.com/ppc64le/build-scripts/tree/master/templates).
+7. Test the build script on clean UBI container before raising PR. Include test logs as part of PR.
+8. Try to create a branch on your forked repo for each PR.