Added github issue templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Create a report to help improve existing features
+labels: ["Type: Possible bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Checklist
+      options:
+        - label: I have used the search function for [**OPEN**](https://github.com/spacecowboy/feeder/issues) issues to see if someone else has already submitted the same bug report.
+          required: true
+        - label: I have **also** used the search function for [**CLOSED**](https://github.com/spacecowboy/feeder/issues?q=is%3Aissue+is%3Aclosed) issues to see if the problem is already solved and just waiting to be released.
+          required: true
+        - label: I will describe the problem with as much detail as possible.
+          required: true
+        - label: If the bug only to occurs with a certain feed, I will include the URL of that feed.
+          required: true
+  - type: input
+    id: version
+    attributes:
+      label: App version
+      description: The latest version can be different on different app stores.
+      placeholder: x.y.z
+    validations:
+      required: true
+  - type: dropdown
+    id: source
+    attributes:
+      label: Where did you get the app from
+      multiple: false
+      options:
+        - Google Play
+        - F-Droid
+        - Other
+    validations:
+      required: true
+  - type: input
+    id: android_version
+    attributes:
+      label: Android version
+      description: Please mention if you are using a custom rom!
+    validations:
+      required: true
+  - type: input
+    id: device
+    attributes:
+      label: Device model
+  - type: input
+    id: first
+    attributes:
+      label: First occurred
+      placeholder: about x days/weeks ago
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      placeholder: |
+        1. This
+        2. Then that
+        3. Then this
+        4. Etc.
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behaviour
+      description: After following the steps, what did you think Feeder would do?
+  - type: textarea
+    id: current
+    attributes:
+      label: Current behaviour
+      description: What did Feeder do instead? Screenshots might help. Usually, you can take a screenshot of your smartphone by pressing *Power* + *Volume down* for a few seconds.
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs
+      description: If you are experiencing a crash, including the stacktrace might help. Leave this blank if you don't know how to find it.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Help & Support
+    url: https://matrix.to/#/#feeder-support:matrix.org
+    about: Reduce developer's support workload by asking other users on the Matrix server.
+

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Request a new feature or enhancement
+labels: ["Needs: Triage", "Type: Feature request"]
+body:
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Checklist
+      options:
+        - label: I have used the search function for [**OPEN**](https://github.com/spacecowboy/feeder/issues) issues to see if someone else has already submitted the same feature request.
+          required: true
+        - label: I have **also** used the search function for [**CLOSED**](https://github.com/spacecowboy/feeder/issues?q=is%3Aissue+is%3Aclosed) issues to see if the feature was already implemented and is just waiting to be released, or if the feature was rejected.
+          required: true
+        - label: I will describe the problem with as much detail as possible.
+          required: true
+        - label: This request contains only one single feature, **not** a list of multiple (related) features.
+          required: true
+  - type: input
+    id: version
+    attributes:
+      label: App version
+      description: The latest version can be different on different app stores.
+      placeholder: x.y.z
+    validations:
+      required: true
+  - type: dropdown
+    id: source
+    attributes:
+      label: Where did you get the app from
+      multiple: false
+      options:
+        - Google Play
+        - F-Droid
+        - Other
+    validations:
+      required: true
+  - type: textarea
+    id: feature
+    attributes:
+      label: Feature or improvement you want
+      description: Try to be as specific as possible. Please not only explain what the feature does, but also how.
+  - type: textarea
+    id: reason
+    attributes:
+      label: Why should this be added?
+      description: What problem does the feature solve? In what use-cases is the feature needed?
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots / Drawings / Technical details
+      description: If your request is about (or includes) changing or extending the UI, describe what the UI would look like and how the user would interact with it.