Add templates for bug reports and feature requests

.github/ISSUE_TEMPLATE/feature-request.yaml

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+name: Feature Request
+description: File a feature request
+title: "[Feature Request]: "
+labels: ["feature-request"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        **Thanks for taking the time to fill out this feature request!**
+        *Please, before opening a feature request, check if similar issues already exist. In that case, use those issues to provide your feedback instead.*
+  - type: checkboxes
+    attributes:
+      options:
+      - label: I searched for similar feature request and found none was relevant.
+        required: true
+  - type: markdown
+    attributes:
+      value: |
+        **Note:** keep in mind that, while InfiniTime is usable, it is still under heavy development and as such it is continuously evolving.
+        Some features you want to see implemented might not be compatible with the current state of the project, or might not even be suitable to include *in the firmware* of the watch.
+  - type: input
+    id: desc-brief
+    attributes:
+      label: Pitch us your idea!
+      description: A one-line elevator pitch of the feature you'd like to see implemented.
+      placeholder: "Ex. My dog wants InfiniTime on its smart collar."
+    validations:
+      required: true
+  - type: textarea
+    id: desc-long
+    attributes:
+      label: Description
+      description: |
+        Give us a detailed description of the feature you are proposing. Mockups or a description of the possible use cases are highly appreciated.
+        Tell us why this should be included in the firmware.
+      placeholder: "Ex. Here is a drawing of my dog wearing an InfiniTime collar and smiling."
+  - type: markdown
+    id: companion-app
+    attributes:
+      value: |
+        If this requires features missing from other software (for example a companion app), please take care of opening any relevant feature request over there as well.