Part of #232 - add issue-template for bug, feature-request and also basic pr-template

.github/ISSUE_TEMPLATE/bug.yml

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+name: Bug
+description: File a bug/issue
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: Thank you for taking the time to file a bug report. To address this bug as fast as possible, we need some information.
+  - type: checkboxes
+    attributes:
+      label: Is there an existing issue for this?
+      description: Please search to see if an issue already exists for the bug you encountered.
+      options:
+        - label: I have searched the existing issues
+          required: true
+  - type: input
+    id: os
+    attributes:
+      label: Operating system
+      description: "Which operating system do you use? Please provide the version as well."
+      placeholder: "Ubuntu 20.04.3 LTS"
+    validations:
+      required: true
+  - type: dropdown
+    id: installation
+    attributes:
+      label: Installation method
+      description: How did you install Betterlockscreen?
+      options:
+        - Package Manager (from OS)
+        - Install-Script
+        - Manual (please specify in the description!)
+    validations:
+      required: true
+  - type: textarea
+    id: betterlockscreen
+    attributes:
+      label: Betterlockscreen & Dependency-Versions
+      description: Please provide the full output of "betterlockscreen -v". For previous versions which do not have this command, please provide the used version(s).
+      render: shell
+      value: |
+        - Betterlockscreen:
+        - i3lock-color:
+        - ImageMagick:
+        - dunst (if used):
+        - feh (if used):
+    validations:
+      required: true
+  - type: textarea
+    id: bug-description
+    attributes:
+      label: Bug description
+      description: What happened?
+    validations:
+      required: true
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      description: Which steps do we need to take to reproduce this error?
+      placeholder: |
+        1. In this environment...
+        2. With this config...
+        3. Run '...'
+        4. See error...
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant log output
+      description: Please provide relevant log output (e.g. from journalctl). No need for backticks here.
+      render: shell

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: Feature Request
+description: You have an idea for extending?
+labels: ["feature-request"]
+body:
+  - type: markdown
+    attributes:
+      value: Thank you for taking the time to share your idea's with us!
+  - type: textarea
+    id: feature-request
+    attributes:
+      label: Feature Request
+      description: Whats your idea?
+    validations:
+      required: true
+  - type: textarea
+    id: steps
+    attributes:
+      label: Implementation
+      description: Can you give us your vision, how you would implement it? (if possible)
+  - type: dropdown
+    id: contribute
+    attributes:
+      label: Have you planned working on this feature?
+      options:
+        - "Yes"
+        - "No"
+    validations:
+      required: true

.github/pull_request_template.md

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+# Description
+
+Please include a summary of the changes and if applicable which issue it fixes. Please also include relevant motivation and context. If there are changes to the dependencies/min. version-constraints please mention them.
+
+Fixes # (issue)
+
+# How Has This Been Tested?
+
+Please describe the tests that you ran to verify your changes.
+
+# Checklist:
+
+- [ ] I have performed a self-review of my own code/checked that ShellCheck succeeds
+- [ ] I have made corresponding changes to the documentation (if applicable)