add gitlab templates

.gitlab/issue_templates/Bug.md

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+# Environment info
+
+<!-- Everything is optional and where applicable but the more information the better. -->
+* Browser, version, OS, platform:
+* Instance URL:
+* Frontend version (see settings -> about):
+* Backend version (see settings -> about):
+* Browser extensions (ublock, rikaichamp etc):
+* Known instance/user customizations (i.e. pleromafe mods/forks, instance styles etc)
+
+# Bug description & reproduction steps
+
+<!-- Type out here how to reproduce the bug, what goes wrong and what should go right -->
+<!-- Screenshots and videos help a lot ;) any observations might also help -->
+<!-- Also mention if there any errors in browser's console if relevant -->
+
+# Bug seriousness
+
+<!-- Everything is optional and free-form -->
+* How annoying it is:
+* How often does it happen:
+* How many people does it affect:
+* Is there a workaround for it:
+
+/label ~Bug

.gitlab/issue_templates/Suggestion.md

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+# Behavior suggestion/Feature request
+<!-- 
+Type out what you want to see changed or what feature you want to see added to 
+PleormaFE. Please also explain how it would benefit users (or admins/moderators)
+and what intended usecase is. Any background information (i.e. porting behavior
+from other frontends/services, specific situations, personal preferences etc.) 
+as well as examples would be greatly appreciated.
+-->
+
+/label ~suggestion
+

.gitlab/issue_templates/default.md

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+<!-- 
+please use one of the templates if applicable, otherwise - type out here 
+in free-form
+-->
+
+/label ~needs-triage
+

.gitlab/merge_request_templates/default.md

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+# Changes
+
+*
+*
+*
+
+<!-- List what your merge request changes and how -->
+<!-- 
+Try to not to break existing behavior, if your changes do break existing behavior 
+make it configurable to toggle between old behavior and new. Which one should be
+default is up to discussion.
+-->
+<!-- If your merge request resolves some issue link it like so: "Closes #99999" -->
+<!-- 
+If merge request adds some new feature that depends on backend: 
+
+1. Make sure it gracefully degrades if backend hasn't been updated to support the feature,
+   we try to make PleromaFE compatible with older versions of BE so that people can still
+   update frontend safely without updating backend since it's costly and much riskier. 
+2. Link related BE merge request here 
+-->
+<!-- Screenshots are welcome -->