Create pull_request_template.md (#120)

.github/pull_request_template.md

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+## Description of the change
+<!--- Describe your changes in detail. -->
+
+## Motivation
+<!--- Why is this change required? What problem does it solve? Please include the corresponding issue number/link if applicable. -->
+
+## Type of change
+Choose one: (Bug fix | Feature request | Documentation | Other)
+
+## Checklist
+<!--- Please make sure all checkboxes are ticked before submitting this PR for review. -->
+- [ ] I have performed a self-review of my code.
+- [ ] I have added detailed comments to my code where applicable.
+- [ ] I have verified that my change does not break existing code.
+- [ ] My PR is based on the latest changes of the main branch (if unsure, please run `git pull --rebase upstream main`).
+- [ ] I am familiar with the [Google Style Guide](https://google.github.io/styleguide/) for the language I have coded in.
+- [ ] I have read through the [Contributing Guide](https://github.com/google/generative-ai-docs/blob/main/CONTRIBUTING.md) and signed the [Contributor License Agreement](https://cla.developers.google.com/about).