[ADD] bug template

.gitlab/issue_templates/Bug.md

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+Summary
+
+(Summarize the bug encountered concisely)
+
+
+Steps to reproduce
+
+(How one can reproduce the issue - this is very important)
+
+
+Example Project
+
+(If possible, please create an example project here on GitLab.com that exhibits the problematic behaviour, and link to it here in the bug report)
+
+(If you are using an older version of GitLab, this will also determine whether the bug has been fixed in a more recent version)
+
+
+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 very hard to read otherwise.)
+
+
+Possible fixes
+
+(If you can, link to the line of code that might be responsible for the problem)
+
+/label ~bug ~reproduced ~needs-investigation
+/cc @project-manager
+/assign @qa-tester
+