chore: add templates for PR & issues (#2)

PR template

issue template for: bug, documentation, enhancement, question

.github/ISSUE_TEMPLATE/1-bug.md

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+---
+name: Bug Report
+about: Use this template to report a bug you encountered.
+title: "Bug: Title"
+labels: bug, 
+assignees:
+---
+
+# Description
+
+## Information
+
+- [ ] Crash
+- [ ] Unexpected behavior (but no crash)
+- [ ] Abnormal ressource usage
+
+## Affected version or commit
+
+...
+
+## Log
+
+### Observed behavior
+
+Describe the problem.
+
+If relevant, add crash log.
+
+### Expected behavior
+
+If relevant, describe the result you would expect.
+
+## Minimal reproducible example
+
+If the bug occurs during execution of a more complex program, this might be needed to better understand the problem. It might even show that the bug does not come from our tools and remove the need for this issue!

.github/ISSUE_TEMPLATE/2-documentation.md

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+---
+name: Documentation 
+about: Use this template to suggest documentation improvements or oversights.
+title: "Doc: Title"
+labels: documentation, 
+assignees:
+---
+
+# Description
+
+## Information
+
+- [ ] Improvements
+- [ ] Additions
+- [ ] Oversights
+- [ ] Other: ...
+
+## Where / What part ?
+
+...
+
+## Suggested / Wanted changes
+
+...

.github/ISSUE_TEMPLATE/3-enhancement.md

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+---
+name: Enhancement / Suggestion
+about: Use this template to suggest new feature or enhancement that could be integrated to the project.
+title: "Enh: Title"
+labels: enhancement/suggestion, 
+assignees:
+---
+
+# Description
+
+## Information
+
+- [ ] Enhancement of existing content
+- [ ] Suggestion for a new feature
+- [ ] Other: ...
+
+## Suggested changes
+
+### Current state
+
+If relevant, add the affected part of the code.
+
+### Proposal
+
+...

.github/ISSUE_TEMPLATE/9-question.md

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+---
+name: Question
+about: Use this template to ask you question about the project.
+title: "Que: Title"
+labels: question, 
+assignees:
+---
+
+# Description
+
+

.github/pull_request_template.md

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+# Description
+
+Summary of the changes if needed.
+
+## Scope
+
+- [ ] Code: if relevant, add affected target
+- [ ] Build script: if relevant, add affected target
+- [ ] Documentation
+- [ ] CI
+- [ ] Repository
+- [ ] Other: ...
+
+## Type of change
+
+- [ ] New feature(s)
+- [ ] Fix: if relevant, add issue #...
+- [ ] Testing
+- [ ] Refactor
+- [ ] Revert
+- [ ] Chore
+
+## Other
+
+- [ ] Breaking change
+- [ ] New dependency
+
+## Necessary follow-up
+
+- [ ] Needs documentation
+- [ ] Needs testing
+- [ ] Other: ...
+
+## Mentions
+
+...