add issue templates and config

Signed-off-by: szaimen <szaimen@e.mail.de>

.github/ISSUE_TEMPLATE/Bug_report.md

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+---
+name: 🐛 Bug report
+about: Help us improving by reporting a bug
+labels: bug, 0. Needs triage
+---
+
+<!--- Please keep this note for other contributors -->
+### How to use GitHub
+
+* Please use the 👍 [reaction](https://blog.github.com/2016-03-10-add-reactions-to-pull-requests-issues-and-comments/) to show that you are affected by the same issue.
+* Please don't comment if you have no relevant information to add. It's just extra noise for everyone subscribed to this issue.
+* Subscribe to receive notifications on status change and new comments. 
+
+<!--- Please fill out the whole template below -->
+### Steps to reproduce
+1.
+2.
+3.
+
+### Expected behaviour <!--- Tell us what should happen -->
+
+### Actual behaviour <!--- Tell us what happens instead -->
+
+---
+
+#### Nextcloud AIO version <!--- (see Nextcloud AIO interface) -->
+
+#### Current channel <!--- (see the channel name in the Mastercontainer section) -->
+
+#### Other valuable info <!--- (like logs, screenshots & Co.) -->

.github/ISSUE_TEMPLATE/Feature_request.md

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+---
+name: 📖 Existing feature/documentation enhancement
+about: Suggest an enhancement of an existing feature/documentation - for other types, please use the feature request option below
+labels: enhancement, 0. Needs triage
+---
+
+<!--- Please keep this note for other contributors -->
+### How to use GitHub
+* Please use the 👍 [reaction](https://blog.github.com/2016-03-10-add-reactions-to-pull-requests-issues-and-comments/) to show that you are interested into the same feature.
+* Please don't comment if you have no relevant information to add. It's just extra noise for everyone subscribed to this issue.
+* Subscribe to receive notifications on status change and new comments. 
+
+<!--- Please fill out the whole template below -->
+### Is your feature request related to a problem? Please describe. 
+<!--- A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] -->
+
+### Describe the solution you'd like
+<!--- A clear and concise description of what you want to happen. -->
+
+### Describe alternatives you've considered
+<!--- A clear and concise description of any alternative solutions or features you've considered. -->
+
+#### Additional context
+<!--- Add any other context or screenshots about the feature request below. -->

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+    - name: 💡 Suggest a new feature or discuss one
+      url:  https://github.com/nextcloud/all-in-one/discussions
+      about: For new feature requests and discussion of existing ones
+    - name: ❓ Community Support and Help
+      url: https://help.nextcloud.com/tag/aio
+      about: For other types of questions
+    - name: 💼 Nextcloud Enterprise
+      url: https://portal.nextcloud.com/
+      about: If you are a Nextcloud Enterprise customer, or need Professional support, so it can be resolved directly by our dedicated engineers more quickly