add artitecture for the project there

commit some chaneges there

feat: update README with key features and project structure; remove obsolete render.yaml

feat: add requirements.txt to define project dependencies

feat: initialize backend server and RAG service infrastructure

feat: implement API utility with timeout handling and backend warmup functionality

fix: add 120s timeout to RAG calls + warm-up ping on backend start

feat: implement RepoLoader page with backend proxying and cold-start handling for Render deployment

Merge branch 'main' of https://github.com/snipeet03/CodeSage

feat: configure Vite dev server with proxy to backend API

feat: configure Vite dev server with proxy for backend API integration

chore: add environment variable template and Vercel deployment configuration

fix: update langchain-huggingface and huggingface-hub versions in requirements.txt

resolve the rag-serveice ther and update the server.js there , resovlve the issue of the dependencies in teh requirements.txt

feat: initialize backend project and add FAISS vector store service