Merge pull request #2271 from aws-lumberyard-dev/Foundation/miterenc/ContributingUpdate

Updating CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+Welcome to the Open 3D Engine! To learn more about contributing to the [O3DE code repo](README.md), check out the [Contributor's Guide](https://github.com/o3de/community/blob/main/CONTRIBUTING.md).
+
+The [O3DE community repo](https://github.com/o3de/community) contains information about how to get started, how the community organizes, and more.
+
+To contribute, please review our [Code of Conduct](https://github.com/o3de/o3de/blob/development/CODE_OF_CONDUCT.md) first. 
+
+## Making contributions with the Developer Certificate of Origin (DCO)
+
+When contributing, your pull requests will require that you have agreed to our DCO found here: [Developer Certificate of Origin](https://developercertificate.org/).  All commits require the --signoff flag to show DCO compliance.
+
+You can do this by using the -s option in git. 
+Example: ```git commit -s -m 'my commit message'```