Add developer README

DEV_README.md

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+# Developer README
+
+This document covers everything you need to set up, run, and work on the Wordle clone locally.
+
+## Tech Stack
+
+- **React 19** for UI components
+- **Parcel** as the build tool / dev server
+- **ESLint** (`react-app` config) + **Prettier** for linting and formatting
+
+## Prerequisites
+
+- [Node.js](https://nodejs.org/) (LTS recommended)
+- npm (bundled with Node.js)
+
+## Getting Started
+
+Install dependencies:
+
+```bash
+npm install
+```
+
+Start the local dev server (Parcel, with hot reloading):
+
+```bash
+npm run dev
+```
+
+This clears the Parcel cache/`dist` folder first (`predev`), then serves
+`public/index.html`. The app will be available at the URL Parcel prints in
+the terminal (typically `http://localhost:1234`).
+
+Build a production bundle:
+
+```bash
+npm run build
+```
+
+Output is written to `dist/`.
+
+## Scaffolding a New Component
+
+This project uses [`new-component`](https://github.com/joshwcomeau/new-component)
+to scaffold consistent component folders:
+
+```bash
+npm run new-component -- ComponentName
+```
+
+This creates a new folder under `src/components/` with the standard
+`ComponentName.js` + `index.js` pair used throughout the codebase.
+
+## Project Structure
+
+```
+public/            Static assets and the HTML entry point
+src/
+  index.js         App entry point
+  constants.js     Shared game constants (word length, guess count, etc.)
+  data.js          Word list(s) used by the game
+  game-helpers.js  Core game logic helpers
+  utils.js         Misc utility functions
+  styles.css       Global styles
+  reset.css        CSS reset
+  components/      React components, one folder per component
+docs/              Images/GIFs used in documentation
+```
+
+## Linting & Formatting
+
+Lint the project with ESLint (configured via `.eslintrc.json`, extending
+`react-app`):
+
+```bash
+npx eslint src
+```
+
+Format files with Prettier:
+
+```bash
+npx prettier --write .
+```
+
+## Notes
+
+- There is no automated test suite in this project yet.
+- Node modules and the `dist`/`.parcel-cache` build artifacts are git-ignored;
+  see `.gitignore` for the full list.