Use issue templates

Two templates: bug report and RFE.

.github/ISSUE_TEMPLATE/Bug_report.md

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+---
+name: Bug report
+about: A report of an error in a recent systemd version
+
+---
+
+** systemd version the issue has been seen with **
+> ...
+
+** Used distribution **
+ > …
+ 
+** Expected behaviour you didn't see **
+ > …
+ 
+** Unexpected behaviour you saw **
+ > …
+ 
+** Steps to reproduce the problem **

.github/ISSUE_TEMPLATE/Feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**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 or screenshots about the feature request here.