Add Proper Documentation, Links and Subgraphs Mermaid Diagram to the Readme File

### Suggested Improvements to the current repo readme.md file

- [ ] Add the description of the projects and the steps required to reproduce it and use it
- [ ] Add the associated links and the contract addresses used for the graph protocol
- [ ] Add the link of the subgraph that is deployed
- [ ] Add a mermaid diagram representing the subgraph's schema. For more information about mermaid files checkout [https://mermaid-js.github.io/mermaid/](url)