chore: Adding issue and PR templates (#3135)

* chore: Adding issue and PR templates

* Temporarily removing CODEOWNERs checkbox as the file doesn't exist yet.

* Adding link to style guide per suggestion

Author: rsamborski

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,30 @@
+---
+name: Bug report
+about: Please let us know which issues you are having.
+title: ''
+labels: 'priority: p2, triage me, type: bug'
+assignees: ''
+
+---
+
+Thanks for stopping by to let us know something could be better!
+
+**PLEASE READ**: If you have a support contract with Google, please create an issue in the [support console](https://cloud.google.com/support/) instead of filing on GitHub. This will ensure a timely response.
+
+**The issue you're having must be related to a file in this repository.** We are unable to provide assistance for issues unrelated to samples in this repository.
+
+Please include as much information as possible:
+
+## In which file did you encounter the issue?
+<!-- Please provide the full path to the file, to avoid ambiguity -->
+
+## Did you change the file? If so, how?
+<!-- A diff would be helpful; otherwise, a description -->
+
+## Describe the issue
+<!-- Please be specific. Copying and pasting your invocation and the entire
+output is often helpful. -->
+
+Making sure to follow these steps will guarantee the quickest resolution possible.
+
+Thanks!

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Let us know how we can make things better.
+title: ''
+labels: 'priority: p3, triage me, type: feature request'
+assignees: ''
+
+---
+
+Thanks for stopping by to let us know something could be better!
+
+**PLEASE READ**: If you have a support contract with Google, please create an issue in the [support console](https://cloud.google.com/support/) instead of filing on GitHub. This will ensure a timely response.
+
+**The issue you're having must be related to a file in this repository.** We are unable to provide assistance for issues unrelated to samples in this repository.
+
+Please include as much information as possible:
+
+## Is your feature request related to a problem? Please describe.
+<!-- A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] -->
+
+## Describe the solution you'd like.
+<!-- A clear and concise description of what you want to happen. -->
+
+## Describe alternatives you've considered.
+<!-- A clear and concise description of any alternative solutions or features you've considered. -->
+
+## Additional context.
+<!-- Add any other context or screenshots about the feature request here. -->
+
+Making sure to follow these steps will guarantee the quickest resolution possible.
+
+Thanks!

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+Fixes #<ISSUE-NUMBER>
+
+Note: Before submitting a pull request, please open an issue for discussion if you are not associated with Google.
+
+## Checklist
+- [ ] I have followed guidelines from [CONTRIBUTING.MD](https://github.com/GoogleCloudPlatform/nodejs-docs-samples/blob/main/CONTRIBUTING.md) and [Samples Style Guide](https://googlecloudplatform.github.io/samples-style-guide/)
+- [ ] **Tests** pass:   `npm test` (see [Testing](https://github.com/GoogleCloudPlatform/nodejs-docs-samples/blob/main/CONTRIBUTING.md#run-the-tests-for-a-single-sample))
+- [ ] **Lint** pass:   `npm run lint` (see [Style](https://github.com/GoogleCloudPlatform/nodejs-docs-samples/blob/main/CONTRIBUTING.md#style))
+- [ ] These samples need a new **API enabled** in testing projects to pass (let us know which ones)
+- [ ] These samples need a new/updated **env vars** in testing projects set to pass (let us know which ones)
+- [ ] This sample adds a new **Product API**, and I updated the [Blunderbuss issue/PR auto-assigner](https://github.com/GoogleCloudPlatform/nodejs-docs-samples/blob/main/.github/blunderbuss.yml) with the codeowners for this sample
+- [ ] Please **merge** this PR for me once it is approved