Add issue templates for bug and feature request

Author: champnic

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Description**
+<!-- A clear and concise description of what the bug is. -->
+<!-- Include callstacks and error messages is possible -->
+
+**Version**
+SDK: <!-- e.g. 0.9.579-prerelease -->
+Runtime: <!-- Browser channel and version, e.g. Canary 86.0.612.0 -->
+Framework: <!-- WPF, WinForms, Win32, etc. -->
+OS: <!-- Win10, Win7, version info if available -->
+
+**Repro Steps**
+<!-- Minimal steps needed to reproduce the bug -->
+<!-- Call out the Expected behavior, and the Actual behavior -->
+
+<!-- Extra / Helpful -->
+**Screenshots**
+
+**Additional context**

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+<!--
+    A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+  -->
+
+**Describe the solution you'd like and alternatives you've considered**
+<!--
+    A clear and concise description of what you want to happen. This may include:
+    - Description of what API need to be added or changed.
+    - Code that shows the surface area of the API.
+    - Code that shows real world scenarios, and how they would otherwise be handled.
+    - Details showing the usage/consumption of the proposed new API, and alternatives (e.g. not having this API).
+    - Any other context or screenshots about the feature request here.
+  -->