Update issue templates (#91)

.github/ISSUE_TEMPLATE/bug.yml

@@ -0,0 +1,79 @@
+name: Report a bug
+description: Create a report to help us improve
+labels: "\U0001F41D bug, \U0001F440 in triage"
+assignees: natsuk4ze
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for using gal!
+        If you are looking for support, please check out our documentation.
+
+          - https://github.com/natsuk4ze/gal/wiki
+          - https://github.com/natsuk4ze/gal/discussions
+  - type: textarea
+    attributes:
+      label: Overview
+      description: Please clarify what kind of bug it is.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Steps to reproduce
+      description: Please tell us exactly how to reproduce the problem you are running into.
+      placeholder: |
+        1. ...
+        2. ...
+        3. ...
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Code sample
+      description: Please create a minimal reproducible sample
+      value: |
+        <details><summary>Code sample</summary>
+
+        ```dart
+        [Paste your code here]
+        ```
+
+        </details>
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Logs
+      description: Please show the error log.
+      value: |
+        <details><summary>Logs</summary>
+
+        ```console
+        [Paste your logs here]
+        ```
+
+        </details>
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Environment
+      description: Please tell us your environment.
+      placeholder: |
+        - Device: [e.g. iPhone14 emulator]
+        - OS: [e.g. iOS16]
+        - gal Version: [e.g. 1.8.0]
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: File you want to save
+      description: Please upload the file if you can.
+      value: |
+        <details>
+        <summary>Screenshots / Video demonstration</summary>
+
+        [Upload media here]
+
+        </details>

.github/ISSUE_TEMPLATE/feature.yml

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+name: Feature requests
+description: Suggest a new idea for gal.
+labels: "✨ feature, \U0001F4A1 idia, \U0001F440 in triage"
+assignees: natsuk4ze
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for using gal!
+        If you are looking for support, please check out our documentation.
+
+          - https://github.com/natsuk4ze/gal/wiki
+          - https://github.com/natsuk4ze/gal/discussions
+  - type: textarea
+    attributes:
+      label: Proposal
+      description: |
+        Briefly but precisely describe what you would like gal to be able to do.
+
+        Consider attaching something showing what you are imagining:
+         * images
+         * videos
+         * code samples
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Use case
+      description: |
+        Please tell us the problem you are running into that led to you wanting
+        a new feature.
+
+        Is your feature request related to a problem? Please give a clear and
+        concise description of what the problem is.
+
+        Describe the alternative solutions you've considered. Is there a package
+        on pub.dev that already solves this?
+    validations:
+      required: true