Added bug template

.gitlab/issue_templates/Bug.md

+<!---
+Please read this!
+
+Before opening a new issue, make sure to search for keywords in the issues
+filtered "bug" label.
+
+For Wallet Backend issue tracker:
+- https://git.fairkom.net/faircoop/BankOfTheCommons/BotC_Overview/issues?label_name%5B%5D=bug
+
+For Wallet Frontend issue tracker:
+- https://git.fairkom.net/faircoop/BankOfTheCommons/wallet-frontend/issues?label_name%5B%5D=bug
+
+and verify the issue you're about to submit isn't a duplicate.
+--->
+
+### Summary
+
+(Summarize the bug encountered concisely)
+
+### Steps to reproduce
+
+(How one can reproduce the issue - this is very important)
+
+### What is the current *bug* behavior?
+
+(What actually happens)
+
+### What is the expected *correct* behavior?
+
+(What you should see instead)
+
+### Relevant logs and/or screenshots
+
+(Paste any relevant logs - please use code blocks (```) to format console output,
+logs, and code as it's tough to read otherwise.)
+
+### Output of checks
+
+(If you are reporting a bug on development env, write: This bug happens on DEV env)
+
+### Service status
+
+(Did you checked on https://status.bankofthecommons.coop is some service affected ?)
+
+### Possible fixes
+
+(If you can, link to the line of code that might be responsible for the problem)
+
+/label ~bug