Add issue template

.gitlab/issue_templates/bug.md

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+# What problem did you encounter
+
+## What is the current behaviour?
+
+## What is the expected behaviour?
+
+## How to reproduce
+
+  Please provide steps to reproduce the issue. If it's a graphical issue please
+  attach screenshot.
+
+# Which version of Calls did you encounter the bug in?
+
+ - [ ] I Compiled it myself. If you compiled Calls from source please provide the
+   git revision via e.g. by running ``git log -1 --pretty=oneline`` and pasting
+   the output below.
+
+ - [ ] I used the precompiled Debian package (e.g. by running a prebuilt
+   image). Please paste the output of ``dpkg -s calls`` below.
+
+```
+  Calls Version:
+```
+
+# What hardware are you running Calls on?
+
+ - [ ] amd64 qemu image
+ - [ ] Librem5 devkit
+ - [ ] other (please elaborte)
+
+# What modem are you using?
+
+# Releveant logfiles
+
+  Please provide relevant logs. You can list the logs since last boot read
+  with ``journalctl -b 0``.