Add ISSUE and PR template

.github/ISSUE_TEMPLATE

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+**Reproduction**: [describe how you are able to reproduce ("trigger") this bug/issue.]
+
+**Expected behavior**: [describe the behavior you would expect the repro to yield.]
+
+**Actual behavior**: [describe the actual behavior, which is presented through the repro.].
+
+**Build information**: [output of `rustc -V`, `git rev-parse HEAD`, `qemu-i386 -version`, `uname -a`, etc.]
+
+**Blocking/related**: [issues or PRs blocking or being related to this issue.]
+
+**Misc**: [optional: for other relevant information that should be known or cannot be described in the other fields.]
+
+------
+
+_If the above does not fit the nature of the issue feel free to modify it._

.github/PULL_REQUEST_TEMPLATE

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+**Problem**: [describe the problem you try to solve with this PR.]
+
+**Solution**: [describe carefully what you change by this PR.]
+
+**Changes introduced by this pull request**:
+
+- [...]
+- [...]
+- [...]
+
+**Drawbacks**: [if any, describe the drawbacks of this pull request.]
+
+**TODOs**: [what is not done yet.]
+
+**Fixes**: [what issues this fixes.]
+
+**State**: [the state of this PR, e.g. WIP, ready, etc.]
+
+**Blocking/related**: [issues or PRs blocking or being related to this issue.]
+
+**Other**: [optional: for other relevant information that should be known or cannot be described in the other fields.]
+
+------
+
+_The above template is not necessary for smaller PRs._