Update issue templates

Change-Id: Iefdf090506a92ca9e6308e59798797b9a8b8d73c

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Sample code or PR with unit test :) (preferable)
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Build:**
+ - compiler: [e.g. clang, gcc]
+ - Version [e.g. 6.0.0]
+ - Link type [static, shared, buildin]
+ - Any specific flags ?
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+**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**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.