[Docs]: Update README.md to Reflect New Architecture and Features

[Harmeet10000]

Type of Documentation Issue

Outdated Documentation

Location

README.md

Description

The README.md does not currently reflect the updated Feature-Based Layered Architecture adopted by the project. It is missing the following:

• The new project folder structure, with clear separation for features, chains, graphs, shared, and core layers.
• A description of the architectural philosophy (vertical slices + horizontal layers).
• Updated diagrams and explanations for how features/modules interact.
• Documentation on new and planned features, including chains, graphs, improved core and shared layers, and feature-specific modules.

Suggested Changes

• Add an updated architecture section describing the Feature-Based Layered Approach and its benefits.

• Include a new project structure tree in the README, such as:

  src/
  ├── api/
  ├── features/
  │   ├── chat/
  │   │   ├── api/
  │   │   ├── services/
  │   │   ├── repositories/
  │   │   ├── models/
  │   │   ├── agents/
  │   │   ├── chains/
  │   │   ├── tools/
  │   │   ├── utils/
  │   │   └── tests/
  │   ├── rag/
  │   │   ├── chains/
  │   └── workflows/
  │       ├── graphs/
  ├── core/
  ├── shared/
  └── main.py
  

• Document the purpose and responsibilities of each layer (API, services, repositories, models, etc.).

• Describe each major feature/module (e.g., chat, rag, workflows, agents, chains, graphs, etc.).

• Add a migration guide or note summarizing the move from the previous structure to the new one.

• List planned or in-progress features to help contributors and users understand the project’s roadmap.

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Example Section for New README.md

## 🚀 Feature-Based Layered Architecture

This project uses a vertical slice (feature-based) architecture, where each business domain (Chat, RAG, Workflows, etc.) encapsulates its own API, services, repositories, models, chains, agents, tools, and tests. Shared/core logic is isolated in dedicated layers.

### Key Directories

- `features/`: All business domains (e.g., chat, rag, documents, workflows)
- `chains/`: Reusable LangChain chain logic per feature
- `graphs/`: LangGraph workflow definitions
- `core/`: Shared infrastructure (database, config, langchain, cache)
- `shared/`: Common utilities, schemas, and constants

### Why this architecture?

- High cohesion and low coupling
- Scalable and easy to navigate
- Promotes team ownership and collaboration

### Planned Features

- Modular `chains` and `graphs` for advanced workflows
- More feature modules (e.g., crawl, mcp_agents)
- Improved documentation and migration guides

For more details, see the Architecture section below.

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Let's use this issue to track and discuss improvements to the documentation, especially the README.md!