Add issue templates (#7)

.github/ISSUE_TEMPLATE/bug.yml

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+name: Bug
+description: Raise a bug related to existing functionality
+labels:
+  - bug
+body:
+  - type: textarea
+    attributes:
+      label: What is the issue?
+      description: |
+        - Give as much detail as you can to help us understand the bug.
+        - Include any error messages or error codes.
+        - Try to add reproduction steps if possible.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Additional information
+      description: Any other context, images or comments to add.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Request a new feature
+labels:
+  - feature
+body:
+  - type: textarea
+    attributes:
+      label: What feature(s) would you like to see?
+      description: |
+        - Give as much detail as you can to help us understand the feature.
+        - What benefits would this feature bring, and how would the user interact with it?
+        - Feel free to give any technical suggestions on how this should be implemented.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Additional information
+      description: Any other context, images or comments to add.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/improvement.yml

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+name: Improvement
+description: Improve any existing functionality, and/or add documentation
+labels:
+  - improvement
+body:
+  - type: textarea
+    attributes:
+      label: What improvement(s) are you suggesting?
+      description: |
+        - Give as many details as you can, including any implementation steps, if any.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Additional information
+      description: Any other context, images or comments to add.
+    validations:
+      required: false