Add pull request template

.github/pull_request_template.md

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+Thank you for your interest in contributing to Core ML Stable Diffusion! Please review [CONTRIBUTING.md](../CONTRIBUTING.md) first. If you would like to proceed with making a pull request, please indicate your agreement to the terms outlined in CONTRIBUTING.md by checking the box below. If not, please go ahead and fork this repo and make your updates.
+
+We appreciate your interest in the project!
+
+Do not erase the below when submitting your pull request:
+#########
+
+- [ ] I agree to the terms outlined in CONTRIBUTING.md 

CONTRIBUTING.md

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 # Contribution Guide
 
-Thanks for your interest in contributing. This project was released for system demonstration purposes and there are limited plans for future development of the repository.
+Thank you for your interest in contributing to Core ML Stable Diffusion! This project was released for system demonstration purposes and there are limited plans for future development of the repository. While we welcome new pull requests and issues please note that our response may be limited. Forks and out-of-tree improvements are strongly encouraged.
 
-While we welcome new pull requests and issues please note that our response may be limited. Forks and out-of-tree improvements are strongly encouraged.
+## Submitting a Pull Request
 
-## Before you get started
+Under the project's [LICENSE](LICENSE.md), confirmation of the following is required to merge your changes:
 
-By submitting a pull request, you represent that you have the right to license your contribution to Apple and the community, and agree by submitting the patch that your contributions are licensed under the [LICENSE](LICENSE).
+*"I agree that all information entered is original and owned by me, and I hereby provide an irrevocable, royalty-free license to Apple to use, modify, copy, publish, prepare derivate works of, distribute (including under the Apple Sample Code License), such information and all intellectual property therein in whole or part, in perpetuity and worldwide, without any attribution."*
 
-We ask that all community members read and observe our [Code of Conduct](CODE_OF_CONDUCT.md).
+By submitting a pull request, you represent that you have the right to license your contribution to Apple and the community, and agree by submitting the patch that your contributions are licensed under the [LICENSE](LICENSE.md).
+
+## Code of Conduct
+
+We ask that all community members read and observe our [Code of Conduct](CODE_OF_CONDUCT.md).