doc: add github PR and Issue templates

Give users reporting bugs a clearer idea of the info that will be
helpful when reporting issues.

Refs: https://github.com/nodejs/node/tree/master/.github

.github/ISSUE_TEMPLATE.md

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+<!--
+Thank you for reporting an issue. The more information you can give us, the
+better the chance we can fix your problem.
+
+This issue tracker is for bugs and issues found within node-gyp,
+if you have an issue installing a specific module, please file an issue on
+that module's issue tracker (find the link with `npm issues modulename`).
+
+Please fill in as much of the template below as you're able.
+
+Node Version: output of `node -v` and `npm -v`
+Platform: output of `uname -a` (UNIX), or
+`systeminfo | findstr /B /C:"OS Name" /C:"OS Version" /C:"System Type"` (Windows)
+Compiler: output of `cc -v` (UNIX) or `msbuild /version & cl` (Windows)
+Module: the module you tried to install.
+-->
+
+* **Node Version**:
+* **Platform**:
+* **Compiler**:
+* **Module**:
+
+<details><summary>Verbose output (from npm or node-gyp):</summary>
+
+<!-- Paste your log between the backticks. If you can't find npm-debug.log then
+do `export npm_config_loglevel=silly` (UNIX) or `set npm_config_loglevel=silly`
+(Windows) before running the `npm install`/`node-gyp build` command, and paste
+the output.
+-->
+
+```
+
+```
+
+</details>
+
+<!-- Enter any further details below this comment. -->

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Thank you for your pull request. Please review below requirements.
+
+Bug fixes and new features should include tests.
+
+Contributor guide: https://github.com/nodejs/node/blob/master/CONTRIBUTING.md
+-->
+
+##### Checklist
+<!-- Remove items that do not apply. For completed items, change [ ] to [x]. -->
+
+- [ ] `npm it` passes
+- [ ] tests are included
+- [ ] documentation is changed or added
+- [ ] commit message follows [commit guidelines](https://github.com/nodejs/node/blob/master/CONTRIBUTING.md#commit-message-guidelines)
+
+##### Description of change
+<!-- Provide a description of the change below this comment. -->