chore: add issue template (#314)

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Create a report to help us improve
+labels: [bug]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        If you are reporting a new issue, make sure that we do not have any duplicates already open. You can ensure this by searching the issue list for this repository. If there is a duplicate, please close your issue and add a comment to the existing issue instead.
+  - type: textarea
+    attributes:
+      label: Describe the bug
+      description: |
+        Briefly describe the problem you are having in a few paragraphs.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Steps to reproduce
+      description: |
+        Provide the steps to reproduce the issue.
+      placeholder: |
+        1. Go to '...'
+        3. Click on '....'
+        4. See error
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Expected behavior
+      description: |
+        Describe what you expected to happen.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Screenshots
+      description: |
+        If applicable, add screenshots to help explain your problem.
+  - type: textarea
+    attributes:
+      label: Provide the Memos version you are using
+      description: |
+        You can find the version in the about dialog of the Memos UI.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Additional context
+      description: |
+        Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest an idea for this project
+labels: [enhancement]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to suggest an idea for Memos!
+  - type: textarea
+    attributes:
+      label: Is your feature request related to a problem?
+      description: |
+        A clear and concise description of what the problem is.
+      placeholder: |
+        I'm always frustrated when [...]
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Describe the solution you'd like
+      description: |
+        A clear and concise description of what you want to happen.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Additional context
+      description: Add any other context or screenshots about the feature request here.