Add templates for issues and pull requests (#1)

Add issue and pr templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Create a report to help us improve
+title: '[Bug]:'
+labels: 'bug'
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. You code
+2. How to execute
+3. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Error messages**
+Detailed error messages.
+
+**Environment (please complete the following information):**
+ - AgentScope Version: [e.g. 0.0.1 via `print(agentscope.__version__)`]
+ - Python Version: [e.g. 3.9]
+ - OS: [e.g. macos, windows]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Suggest an idea for this project
+title: '[Feature]: '
+labels: 'enhancement'
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/PULL_REQUEST_TEMPLATE.md

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+---
+name: Pull Request
+about: Create a pull request
+---
+## Description
+
+[Please describe the background, purpose, changes made, and how to test this PR]
+
+
+
+## Checklist
+
+Please check the following items before code is ready to be reviewed.
+
+- [ ]  Code has passed all tests
+- [ ]  Docstrings have been added/updated in Google Style
+- [ ]  Documentation has been updated
+- [ ]  Code is ready for review