Add pull request & issue templates

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: "Bug report"
+description: "Template for bug reports"
+labels: [ bug ]
+body:
+  - type: textarea
+    attributes:
+      label: "Issue description"
+      description: "Please describe the issue you're experiencing as detailed as possible."
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: "To reproduce"
+      description: "How can the bug be reproduced?"
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: "Expected behaviour"
+      description: "What did you expect to happen?"
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: "Screenshots / videos"
+      description: "Link screenshots and videos here if you have any"
+    validations:
+      required: false
+  - type: input
+    attributes:
+      label: "MCHR version"
+      description: "MCHR version"
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: "Additional information"
+      description: "Anything else you want to share?"
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/contribution-request.yml

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+name: "Contribution request"
+description: "Template for contribution requests"
+labels: [ enhancement ]
+body:
+  - type: dropdown
+    attributes:
+      label: "Type"
+      options: [ "New feature", "Bugfix", "Documentation", "Other" ]
+    validations:
+      required: true
+  - type: input
+    attributes:
+      label: "If you chose 'other': Specify the contribution type"
+    validations:
+      required: false
+  - type: textarea
+    attributes:
+      label: "Changes"
+      description: "Please describe what you would like to change. Be as precise as possible."
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: "Relevant issues"
+      description: "Please link any relevant issues here."
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: "Feature request"
+description: "Template for feature requests"
+labels: [ enhancement ]
+body:
+  - type: textarea
+    attributes:
+      label: "Feature description"
+      description: "Please describe the feature you want added in as much detail as possible."
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: "Relevant issues"
+      description: "Please link any relevant issues here."
+    validations:
+      required: false

.github/pull_request_template.md

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+## Changes
+
+*Please list your changes here. Be as precise as possible.*
+
+## Reference issue
+
+*Please reference the issue you created / claimed here.*
+
+## Other issues
+
+*If there are any other relevant issues, link them here. For example, if this is a bugfix and there is an issue that reports the bug you have fixed,
+link the issue like this: 'Fixes #ISSUE'*