chore: Add a template for issues

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Report a bug to help us improve RustOwl
+labels: bug
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for reporting a bug!
+
+        Before submitting, please search existing issues to avoid duplicates. If a similar issue exists, comment there instead of opening a new one.
+
+        To help us resolve the issue efficiently, please provide the necessary details below.
+
+  - type: textarea
+    id: bug-description
+    attributes:
+      label: Bug Description
+      description: Describe the issue you encountered.
+      placeholder: Provide a clear and concise description of the problem, including what you expected to happen and what actually occurred.
+    validations:
+      required: true
+
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: Provide details about your setup.
+      placeholder: |
+        - OS: [e.g., Windows 11, macOS Sequoia 15.2, Ubuntu 24.04]
+        - rustc Version: [e.g., 1.84.1 (e71f9a9a9 2025-01-27)]
+        - rustup Version: [e.g., 1.27.1 (54dd3d00f 2024-04-24)]
+        - RustOwl Version: [e.g., v0.1.1]
+        - Editor: [e.g., VSCode 1.97, Neovim, Emacs]
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest an idea for RustOwl
+labels: enhancement
+body:
+  - type: textarea
+    attributes:
+      label: What is the problem you're trying to solve
+      description: |
+        A clear and concise description of what the problem is.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Describe the solution you'd like
+      description: |
+        A clear and concise description of what you'd like to happen.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Additional context
+      description: |
+        Add any other context about the feature request here.