Update issue templates

.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: ''
+
+---
+
+# Bug Report template
+
+### Describe the bug
+
+A clear and concise description of what the bug is.
+
+### How to Reproduce
+
+Steps to reproduce the behavior:
+
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+### Expected behavior
+
+A clear and concise description of what you expected to happen.
+
+### Screenshots
+
+If applicable, add screenshots to help explain your problem.
+
+### Please complete the following information:
+
+- Type: [e.g. src, tests, examples, benchmarks]
+- OS: [e.g. linux, win32]
+- Compiler [e.g. gcc, clang]
+- Compiler Version [e.g. 8.1.0]
+
+### 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
+title: ''
+labels: feature request
+assignees: ''
+
+---
+
+# Feature Request Template
+
+### What is the nature of this request?
+
+* New functionalities
+* Change in standards
+* Change in source code details (names of variables, functions, parameters, etc)
+
+### 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.