Add issue templates for this repo

- bug report template
- feature request template

Co-authored-by: fabothch <[email protected]>

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: unconfirmed
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behaviour:
+
+1. happens with input (include input files)
+2. start `xtb` with (all the options here)
+3. run `xtb` with your options and the `--verbose` flag
+4. output showing the error
+
+Please provide all input and output file such that we confirm your report.
+
+**Expected behaviour**
+A clear and concise description of what you expected to happen.
+
+**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: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is.
+
+**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.
+
+**If possible state how you can assist in providing data or code to to implement the feature**
+A short description of what you can provide to make the feature possible.
+
+**Additional context**
+Add any other context about the feature request here.