docs(issues): add issue templates [skip ci]

Author: solkimicreb

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**React Easy State version:** x.x.x
+**Platform:** browser / node / react-native / other
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+---
+
+### For tougher bugs
+
+**To Reproduce**
+Steps to reproduce the behavior.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+---
+
+### For the toughest bugs only
+
+**[CodeSandbox](https://codesandbox.io/s/github/RisingStack/react-easy-state/tree/master/examples/stop-watch) reproduction**
+A demo application that showcases the bug.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is.
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered or seen elsewhere**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context about the feature request here.