chore: add issue and PR templates

Author: Narretz

.github/ISSUE_TEMPLATE.md

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+**Note: for support questions, please use one of these channels:** https://github.com/angular/angular.js/blob/master/CONTRIBUTING.md#question. This repository's issues are reserved for feature requests and bug reports.
+
+* **Do you want to request a *feature* or report a *bug*?**
+
+
+
+* **What is the current behavior?**
+
+
+
+* **If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem** via
+https://plnkr.co or similar (you can use this template as a starting point: http://plnkr.co/edit/tpl:yBpEi4).
+
+
+
+* **What is the expected behavior?**
+
+
+
+* **What is the motivation / use case for changing the behavior?**
+
+
+
+* **Which version of Angular, and which browser and OS does this issue affect?** Did this work in previous
+versions of Angular? Please also test with the latest stable ánd snapshot versions.
+
+
+
+* **Other information** (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix)

.github/PULL_REQUEST_TEMPLATE.md

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+* **What kind of change does this PR introduce?** (Bug fix, feature, docs update, ...)
+
+
+
+* **What is the current behavior?** (You can also link to an open issue here)
+
+
+
+* **What is the new behavior (if this is a feature change)?**
+
+
+
+* **Does this PR introduce a breaking change?**
+
+
+
+* **Please check if the PR fulfills these requirements**
+- [ ] The commit message follows our guidelines: https://github.com/angular/angular.js/blob/master/CONTRIBUTING.md#commit-message-format
+- [ ] Tests for the changes have been added (for bug fixes / features)
+- [ ] Docs have been added / updated (for bug fixes / features)
+
+* **Other information**:
+