Add issue template (#1371)

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Anything that does not work as expected is a bug, including code, docs and tests.
+title: ''
+labels: bug
+assignees: ''
+---
+
+#### Description
+
+<!-- A clear and concise description of what the bug is, and what the expected behavior is. Be sure to check before the relevant sections at http://visgl.github.io/react-map-gl/docs and the issues list at https://github.com/visgl/react-map-gl/issues -->
+
+#### Repro Steps
+
+<!-- Steps to reproduce the behavior. -->
+<!-- Providing the following could help us resolve this issue faster:
+- A Codepen [example](https://codepen.io/vis-gl) or an equivalent online service that reproduces the behavior
+-->
+
+#### Environment (please complete the following information):
+
+- Library Version: [e.g. react-map-gl 6.1.10]
+- Mapbox Version: [e.g. mapbox-gl 2.1.1]
+- React Version: [e.g. react 17.0.1]
+- Browser Version: [e.g. Chrome 88.0]
+- OS: [e.g. Mac OS X 11.2]
+
+#### Logs
+
+<!-- Check the browser console for any relevant errors or warnings. -->

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: I have a question / I need help
+    url: https://github.com/visgl/react-map-gl/discussions
+    about: Ask generic questions or request help here