Add gitlab template for bug and feature request

.gitlab/issue_templates/bug.md

+# Bug report
+
+## Version of X!TandemPipeline 
+(Which version of X!TandemPipeline bug)
+
+## Error message
+(If an error message or a warning pop-up past-it here)
+
+## File used
+(Copy the file path used when the bug occured)
+
+## Steps to reproduce
+(How one can reproduce the issue - **very important**)
+
+## What is the expected correct behavior?
+(What you should see instead)
+
+## Optional
+### 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)

.gitlab/issue_templates/feature_request.md

+# New Feature request
+
+## Feature description
+(Describe shortly the feature)
+
+## Feature position
+(Where the new feature is located, *for a new widget describe its position according the other widget in the window*)
+
+## New Widget description
+(*Optional, what the new widget should look like*)
+
+## Expected Result
+(What is the expected result: description or example)
+
+