Feature: Add support for custom issue templates

[d-oit]

It would be great to add support for custom issue templates that users can define for their specific workflows.

Description:
Allow users to create custom templates for different types of issues (e.g., user stories, technical tasks, research spikes).

Benefits:

• Improved consistency across issues
• Better organization of information
• Faster issue creation process

Proposed implementation:

• Template configuration file
• CLI flag to specify template
• Default templates for common use cases

[d-oit]

/create-sub-issues "Template Configuration" "Create configuration system for custom templates" "Template CLI Integration" "Add CLI flags and options for template selection"