Improve Github templates for issues and pull-requests

[brian-ai-assistant-dev]

Assign this issue to @brian-assistant and Brian will help you.

Brian AI will process with following task:

The current Github issue and pull-request templates are basic and could be improved to provide more information and structure for contributors. They should include:

• Clear descriptions of the issue or pull-request
• Steps to reproduce or implement
• Additional context or screenshots
• Checklist of tasks to complete

These templates should be written using clear and concise language, and be easy to navigate and complete for contributors.

1. Create new markdown files for each template in the .github/ISSUE_TEMPLATE folder.
2. Define the structure and requirements of the templates using markdown syntax.
3. Include clear and concise instructions for contributors in the templates.
4. Review and revise the templates with the help of other contributors.
5. Publish the new templates on the GitHub repository.