Update issue templates

Author: ymh199478

.github/ISSUE_TEMPLATE/---bug-report.md

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+---
+name: "\U0001F41B Bug Report"
+about: Report a general framework issue. Please ensure your CatLib version is still
+  supported.
+title: "[BUG] Add a placeholder for issues title, ex."
+labels: Need Review, bug
+assignees: yb199478
+
+---
+
+**CatLib version(s) affected**: x.y.z
+
+#### Description
+
+<!-- A clear and concise description of the problem. -->
+
+#### How to reproduce
+<!-- Code and/or config needed to reproduce the problem. -->
+
+#### Possible Solution
+
+<!--- Optional: only if you have suggestions on a fix/reason for the bug -->
+
+#### Additional context
+
+<!-- Optional: any other context about the problem: log messages, screenshots, etc. -->

.github/ISSUE_TEMPLATE/---documentation-issue.md

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+---
+name: "\U0001F4DA Documentation Issue"
+about: For documentation issues, open a pull request at https://github.com/catlib/catlib-en.io
+title: "[Document] Add a placeholder for issues title, ex."
+labels: Document, Need Review
+assignees: yb199478
+
+---
+
+The CatLib documentation has its own dedicated repository. Please open a pull request at https://github.com/catlib/catlib-en to correct the issue you have found.
+
+Thanks!

.github/ISSUE_TEMPLATE/---feature-request.md

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+---
+name: "\U0001F4A1 Feature Request"
+about: Suggest an idea for this project
+title: "[Feature] Suggested as the issues title, ex."
+labels: Feature, Need Review
+assignees: yb199478
+
+---
+
+If you would like to propose new CatLib features, please make a pull request, or open an issue.