Add GitHub issue and PR templates with standardized formats

Author: kangju2000

.github/ISSUE_TEMPLATE.md

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+## Issue Type
+<!-- Please mark with an x in the appropriate brackets -->
+- [ ] Bug Report
+- [ ] Feature Request
+- [ ] Documentation Improvement
+- [ ] Other
+
+## Description
+<!-- Please provide a clear description of the issue -->
+
+## Steps to Reproduce
+<!-- For bugs, please list the steps to reproduce the issue -->
+1.
+2.
+3.
+
+## Expected Behavior
+<!-- Describe what you expected to happen -->
+
+## Additional Information
+<!-- Add any other context about the issue here -->

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Report a bug to help us improve
+title: "[Bug]: "
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: A clear and concise description of the bug
+      placeholder: Tell us what happened
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps-to-reproduce
+    attributes:
+      label: Steps to Reproduce
+      description: Steps to reproduce the behavior
+      placeholder: |
+        1. Go to '...'
+        2. Click on '....'
+        3. Scroll down to '....'
+        4. See error
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected-behavior
+    attributes:
+      label: Expected Behavior
+      description: A clear and concise description of what you expected to happen
+    validations:
+      required: true
+
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: Information about your environment
+      placeholder: |
+        - OS: [e.g. macOS, Windows]
+        - Node version: [e.g. 18.16.0]
+    validations:
+      required: false
+
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional Context
+      description: Add any other context about the problem here
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest an idea for this project
+title: "[Feature]: "
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for suggesting a new feature!
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem Description
+      description: Is your feature request related to a problem? Please describe.
+      placeholder: I'm always frustrated when...
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed Solution
+      description: Describe the solution you'd like
+      placeholder: I would like to see...
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: Describe any alternative solutions or features you've considered
+    validations:
+      required: false
+
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional Context
+      description: Add any other context or screenshots about the feature request here
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/other.yml

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+name: Other Issue
+description: Report an issue that doesn't fit into other categories
+title: "[Other]: "
+labels: ["other"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to report this issue!
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: A clear and concise description of the issue
+      placeholder: Describe your issue here...
+    validations:
+      required: true
+
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional Context
+      description: Add any other context about the issue here
+    validations:
+      required: false

.github/PULL_REQUEST_TEMPLATE.md

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+## Changes
+<!-- Briefly describe the changes made in this PR -->
+
+
+