Add contribution templates

.github/CODEOWNERS

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+* @Naios

.github/CONTRIBUTING.md

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+Thank you for contributing to continuable!
+=========================================
+
+## Notifications
+
+Usually I try to respond to issues and pull requests as fast as possible. In case you are waiting longer for my response, you may notify me through mail: `denis.blank <at> outlook <dot> com`.
+
+## Templates
+
+Please use the issue/PR templates which are inserted automatically.
+

.github/ISSUE_TEMPLATE.md

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+@Naios <!-- This is required so I get notified properly -->
+
+<!-- Please replace {Please write here} with your description -->
+
+<!-- Questions are highly welcomed! For those you may delete the template below. -->
+
+-----
+
+### Commit Hash
+
+{Please write here}
+
+### Expected Behavior
+
+{Please write here}
+
+### Actual Behavior
+
+{Please write here}
+
+### Steps to Reproduce
+
+{Please write here}
+
+### Your Environment
+
+- OS: {Please write here - Windows/Linux dist/OSX}
+- Compiler and version: {Please write here - MSVC/Clang/GCC/Other}
+- Standard library (if non default): {Please write here}
+

.github/PULL_REQUEST_TEMPLATE.md

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+@Naios <!-- This is required so I get notified properly -->
+
+<!-- Thank you for your contribution to dot-github! Please replace {Please write here} with your description -->
+
+-----
+
+### What was a problem?
+
+{Please write here}
+
+### How this PR fixes the problem?
+
+{Please write here}
+
+### Check lists (check `x` in `[ ]` of list items)
+
+- [ ] Additional Unit Tests were added that test the feature or regression
+- [ ] Coding style (Clang format was applied)
+
+### Additional Comments (if any)
+
+{Please write here}