Add Github issue and pull request templates

Fix #180
Close #185

.github/ISSUE_TEMPLATE.md

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+<!--
+React Native for Web is an implementation of React Native. If you have feature
+requests, you should post them to https://productpains.com/product/react-native/.
+
+GitHub issues should only be used for bugs or Web-specific features you believe
+React Native requires.
+
+Make sure to add ALL the information needed to understand the bug so that
+someone can help. If the info is missing we'll add the 'needs more information'
+label and close the issue until there is enough information.
+-->
+
+**What is the current behavior?**
+
+Link to minimal test case: (template: [codepen](https://codepen.io/necolas/pen/PZzwBR?editors=0010))
+
+**What is the expected behaviour?**
+
+**Steps to reproduce**
+
+1.
+2.
+
+**Environment (include versions)**
+
+OS:
+Device:
+Browser:
+React Native for Web (version):
+React (version):

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Thanks for submitting a pull request! Make sure the PR does only one thing.
+Please provide enough information so that others can review your pull
+request. Make sure you have read the Contributing Guidelines -
+https://github.com/necolas/react-native-web/CONTRIBUTING.md
+-->
+
+**This patch solves the following problem**
+
+**Test plan**
+
+**This pull request**
+
+- [ ] includes documentation
+- [ ] includes tests
+- [ ] includes an interactive example
+- [ ] includes screenshots/videos