Add github templates for issues and PRs (#725)

* chore: add github templates

* chore: add note about accessibility supported

* chore: simplify, add note about Shadow DOM

* chore: simplify issue & PR templates

doc/.github/ISSUE_TEMPLATE.md

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+<!-- Thanks for reporting an issue to axe-core. Please provide all necessary info to reproduce the issue. Without adequate details, your issue may be closed without investigation. 
+
+If you’re reporting a bug, include a description of the issue and a page or code snippet where it can be reproduced. Please make sure you have tested this with the latest version of axe-core. When proposing a new rule, please use our rule template: https://github.com/dequelabs/axe-core/blob/develop/doc/rule-proposal.md
+
+Describe what the desired behavior would be, and how it applies to axe-core's  "Accessibility Supported" policy: https://github.com/dequelabs/axe-core/blob/develop/doc/accessibility-supported.md
+-->
+
+- Link to live demo:
+
+<pre><code>
+axe-core version: X.Y.Z
+axe-webdriver, extension or other integration version: X.Y.Z
+
+Browser and Assistive Technology versions
+
+For Tooling issues:
+- Node version: XX  <!-- run `node --version` -->
+- Platform:  <!-- Mac, Linux, Windows -->
+</code></pre>

doc/.github/PULL_REQUEST_TEMPLATE.md

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+## PR Checklist
+Please check if your PR fulfills the following requirements:
+
+- [ ] The commit message(s) follow our guidelines: https://github.com/dequelabs/axe-core/blob/develop/doc/code-submission-guidelines.md#git-commits
+- [ ] Changes to rules and checks appropriately support [Shadow DOM](https://github.com/dequelabs/axe-core/blob/develop/doc/developer-guide.md)
+- [ ] Changes have been tested in [major browsers and Assistive Technologies](https://github.com/dequelabs/axe-core/blob/develop/doc/accessibility-supported.md#accessibility-supported)
+- [ ] Tests for the changes have been added (for bug fixes / features)
+- [ ] Docs have been added / updated (for bug fixes / features)
+
+## Description of the changes
+- Github issue:
+
+
+## Does this PR introduce a breaking change?
+```
+[ ] Yes
+[ ] No
+```
+
+
+## Other information