docs: expand README with stack, setup, and scripts

README.md

@@ -1,3 +1,65 @@
+# static-frontend
 
-env file
+React frontend for Static Exchange — a cross-chain swap UI that connects Solana wallets (via `@solana/wallet-adapter`) and EVM wallets on Polygon (via `@web3modal/ethers`) and talks to a GraphQL backend through Apollo Client.
+
+## Tech stack
+
+- React 18 + TypeScript (Create React App / `react-scripts`)
+- Tailwind CSS
+- Apollo Client + GraphQL
+- `@solana/web3.js` + Solana wallet adapter
+- `ethers` v6 + WalletConnect's Web3Modal
+- WebLN for Lightning interactions
+
+## Prerequisites
+
+- Node.js 16+
+- A package manager: `bun`, `yarn`, or `npm` (lockfiles for all three are present in the repo)
+- A WalletConnect Cloud project ID (see https://cloud.walletconnect.com)
+
+## Setup
+
+Install dependencies:
+
+```bash
+bun install
+# or: yarn install
+# or: npm install
+```
+
+Create a `.env` file in the project root with at least:
+
+```
+REACT_APP_WALLET_CONNECT_PROJECT_ID=<your WalletConnect project id>
+```
+
+Additional environment variables are documented at:
 https://www.notion.so/Static-frontend-env-9e7224d8da0d4979857e04b8bf7f1f31?pvs=4
+
+## Scripts
+
+The following scripts are defined in `package.json`:
+
+| Command | Description |
+| --- | --- |
+| `npm start` | Run the app in development mode at http://localhost:3000 |
+| `npm run build` | Build the production bundle into `build/` |
+| `npm test` | Run the test suite in watch mode |
+| `npm run eject` | Eject from Create React App (one-way operation) |
+
+Substitute `bun run` or `yarn` for `npm run` as preferred.
+
+## Project structure
+
+```
+src/
+  App.tsx              Root component: Apollo + Web3Modal setup
+  Chain.tsx            Chain selector
+  Connect.tsx          Wallet connection UI
+  Swap.tsx             Swap flow
+  Order.tsx            Order display
+  SolAddress.tsx       Solana address handling
+  PolygonAddress.tsx   Polygon address handling
+  Loading.tsx          Loading state
+  constants.ts         Shared constants
+```