Added templates for issues and merge requests

.gitlab/issue_templates/Bug.md

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+Please add the following, if applicable, remove otherwise:
+
+## Summary ##
+
+(max. 60 words)
+
+## Basic information ##
+
+ - Version:
+ - Component:
+ - Platform: (RasPi, x86_64, i686)
+
+## Description ##
+
+### Expected behaviour ###
+
+### Actual behaviour ###
+
+### Reproduction steps ##
+
+(Please attach files if necessary)
+
+## Other things to be mentioned ##
+
+(Ideas for fixing, requests for comments, …)

.gitlab/issue_templates/Enhancement.md

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+## Summary ##
+
+(max 60 words)
+
+## Basic information ##
+
+ - Component:
+ - New node needed: (Yes/No)
+
+## Description ##
+
+As a <role>, I want to <what?>
+
+## Acceptance criteria ##
+
+(How should this be in the end?)

.gitlab/merge_request_templates/Ready_to_Merge.md

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+As mentioned in <Merge Request Reference>, this implements <What?>.
+
+This includes the following changes:
+ - …
+ - …

.gitlab/merge_request_templates/Work_In_Progress.md

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+As mentioned in <Merge Request Reference>, this implements <What?>
+
+For this, the following steps are needed:
+
+ - [ ] List
+ - [ ] of
+ - [ ] steps
+   - [ ] and
+   - [ ] substeps