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docs: add simplified architecture guide for beginners #36

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13 changes: 13 additions & 0 deletions README.md
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Expand Up @@ -35,3 +35,16 @@ GreenCode/
└── docker-compose.yml # Docker orchestration




## Simplified Architecture Guide (For Beginners)

GreenCode is built using three main layers:

1. **Frontend** — The React user interface that people interact with in the browser.
2. **Backend API** — A Spring Boot application that handles all business logic and data processing.
3. **Database** — PostgreSQL stores all data permanently, while H2 is used for testing.

These three layers communicate with each other over HTTP using REST APIs.
When a user clicks a button on the frontend, a request is sent to the backend,
which then reads or writes data to the database and sends a response back.