Added README.md to samples folder for contributors to distinguish from demos

samples/README.md

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+# XR Blocks Samples Submission
+
+Thank you creators for contributing to XR Blocks! We firmly believe
+that with your contribution, we can inspire more hackers, designers, and
+practitioners to unleash their creativity! Let's make AI + XR accessible to
+everyone so they may bring their ideas to life faster.
+
+For advanced demo to demonstrate creative use cases, we suggest you submit to
+`/demos/`.
+
+## Contributing a New Sample
+
+### Step 1: Clone this repository and sign contributor agreement
+
+Fork this repository and clone the forked repo to your laptop or workstation.
+Review and sign the
+[Contributor Licence Agreement](https://cla.developers.google.com/about) (CLA).
+Now you are ready to create a pull request :)
+
+### Step 2: Create Your Sample
+
+Follow README.md in the root folder to set up your development workflow. Create
+a new sample by starting from scratch or an existing template from `/templates/`
+or `/samples/`.
+
+When using third-party assets, make sure they are compatible with Apache 2
+license and add corresponding LICENSE file to the demo folder.
+
+### Step 3: Create a pull request
+
+Now that your files are created and configured correctly, commit and create a
+pull request by following
+[the official GitHub guide](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request).
+
+## Community Guidelines
+
+This project follows [Google's Open Source Community Guidelines](https://opensource.google/conduct/).