Add Gitlab issue templates

.gitlab/issue_templates/Bug.md

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+Detailed description of the issue. Provide as much information as you can, potentially with images showing the issue.
+
+Steps to reproduce:
+
+1. Open Fractal
+2. Enter a room
+3. ...
+
+## Design Tasks
+
+* [ ]  design tasks
+
+## Development Tasks
+
+* [ ]  development tasks
+
+## QA Tasks
+
+* [ ]  quality assurance tasks

.gitlab/issue_templates/Feature.md

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+Detailed description of the feature. Provide as much information as you can.
+
+Proposed Mockups:
+
+(Add mockups of the proposed feature)
+
+## Design Tasks
+
+* [ ]  design tasks
+
+## Development Tasks
+
+* [ ]  development tasks
+
+## QA Tasks
+
+* [ ]  quality assurance tasks