Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve skprogs
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+<!-- A clear and concise description of what the bug is.-->
+
+**To Reproduce**
+<!-- Steps to reproduce the behaviour:
+
+1. minimal example of how to trigger the bug (include self-contained input file)
+2. which version of DFTB+ is used (downloaded, conda-forge or build from source),
+   if built from source include the git commit, the compiler and used libraries
+3. output showing the error
+
+All input and output files required to confirm your report. -->
+
+**Expected behaviour**
+<!-- A clear and concise description of what you expected to happen, instead of what occurred -->
+
+**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 the skprogs project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**What is your suggested feature? Please describe.**
+<!-- A clear and concise description of your suggestion. -->
+
+**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. -->
+
+**Additional context**
+<!-- Add any other context about the feature request here. -->