Set up issue/pr templates

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: Bug Report
+description: Report a bug encountered while using the Markwhen plugin
+labels: ['triage']
+body:
+    - type: textarea
+      id: problem
+      attributes:
+          label: What happened?
+          description: |
+              Please provide as much info as possible.
+      validations:
+          required: true
+
+    - type: textarea
+      id: expected
+      attributes:
+          label: What did you expect to happen?
+      validations:
+          required: true
+
+    - type: textarea
+      id: repro
+      attributes:
+          label: How can we reproduce it (as minimally and precisely as possible)?
+      validations:
+          required: true
+
+    - type: textarea
+      id: additional
+      attributes:
+          label: Anything else we need to know?
+
+    - type: input
+      id: pluginVersion
+      attributes:
+          label: Plugin version
+          description: You can find the version under Settings -> Community plugins -> Installed plugins -> Chem.
+      validations:
+          required: true
+
+    - type: input
+      id: obsidianVersion
+      attributes:
+          label: Obsidian version
+          description: You can find the version under Settings -> About -> Current version.
+      validations:
+          required: true

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: Feature Request
+description: Suggest a new feature
+labels: ['triage']
+body:
+    - type: textarea
+      id: feature
+      attributes:
+          label: What would you like to be added?
+      validations:
+          required: true
+
+    - type: textarea
+      id: rationale
+      attributes:
+          label: Why is this needed?
+      validations:
+          required: true