feat: claude marketplace plugin for accelerated development with ragbits

Description
Create a plugin/skills set for Ragbits users to support the creation of key Ragbits-based solutions and components.

Definition of Done
	•	Provide functionality that enables users to create:
	•	chat applications
	•	RAG pipelines
	•	agents
	•	MCP servers
	•	Create a new repository dedicated to this project