add PR and issue template for agentCube

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Report a bug encountered
+title: ''
+labels: kind/bug
+assignees: ''
+
+---
+
+<!-- Please use this template while reporting a bug and provide as much info as possible. Not doing so may result in your bug not being addressed in a timely manner. Thanks!
+-->
+
+**What happened**:
+
+**What you expected to happen**:
+
+**How to reproduce it (as minimally and precisely as possible)**:
+
+**Anything else we need to know?**:
+
+**Environment**:
+
+- AgentCube version:
+- Kubernetes version:
+- Other components version:

.github/ISSUE_TEMPLATE/enhancement.md

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+---
+name: Enhancement Request
+about: Suggest an enhancement to the project
+title: ''
+labels: kind/enhancement
+
+---
+<!-- Please only use this template for submitting enhancement requests -->
+
+**What would you like to be added**:
+
+**Why is this needed**:

.github/ISSUE_TEMPLATE/good-first.md

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+---
+name: Good First Issue
+about: Publish a good first issue
+labels: good first issue
+
+---
+
+<!-- Please use this template while publishing a good first issue. Thanks!
+-->
+
+**Task description**:
+
+**Solution**:
+
+**Who can join or take the task**:
+
+The good first issue is intended for `first-time contributors` to get started on his/her contributor journey.
+
+After a contributor has successfully completed 1-2 good first issues,
+they should be ready to move on to `help wanted` items, saving the remaining `good first issue` for other new contributors.
+
+**How to join or take the task**:
+
+Just reply on the issue with the message `/assign` in a separate line.
+
+Then, the issue will be assigned to you.
+
+**How to ask for help**:
+
+If you need help or have questions, please feel free to ask on this issue.
+The issue author or other members of the community will guide you through the contribution process.

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Question relating to agentCube.
+labels: question
+
+---
+
+<!-- Please use this template while asking a new question. Thanks!
+Please make sure you have read the FAQ and searched the issue list.
+- FAQ: To be added
+- Issues: https://github.com/volcano-sh/agentcube/issues?q=is%3Aissue+
+-->
+
+**Please provide an in-depth description of the question you have**:
+
+**What do you think about this question?**:
+
+**Environment**:
+
+- agentCube version:
+- Kubernetes version:
+- Other components version:

.github/PULL_REQUEST_TEMPLATE.md

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+**What type of PR is this?**
+
+<!--
+Add one of the following kinds:
+/kind bug
+/kind feature
+/kind documentation
+/kind cleanup
+
+Optionally add one or more of the following kinds if applicable:
+/kind api-change
+/kind deprecation
+/kind failing-test
+/kind flake
+/kind regression
+
+-->
+
+**What this PR does / why we need it**:
+
+**Which issue(s) this PR fixes**:
+<!--
+*Automatically closes linked issue when PR is merged.
+Usage: `Fixes #<issue number>`, or `Fixes (paste link of issue)`.*
+-->
+Fixes #
+
+<!--
+*Optionally link to the umbrella issue if this PR resolves part of it.
+Usage: `Part of #<issue number>`, or `Part of (paste link of issue)`.*
+Part of #
+-->
+
+**Special notes for your reviewer**:
+<!--
+Such as a test report of this PR.
+-->
+
+**Does this PR introduce a user-facing change?**:
+<!--
+If no, just write "NONE" in the release-note block below.
+If yes, a release note is required.
+Some brief examples of release notes:
+1. `API Change`: Introduced `spec.<field>` to the PropagationPolicy API for xxx.
+2. `Bug Fix`: Fixed the bug that xxx.
+-->
+
+```release-note
+
+```