Create CONTRIBUTING.md

Author: joetannenbaum

CONTRIBUTING.md

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+# Contributing
+
+Thank you for your interest in contributing to Laravel Echo! Your contributions help make this project better for everyone.
+
+Echo is maintained as a monorepo using [pnpm workspaces](https://pnpm.io/workspaces). Below you'll find an overview of the repository and how to get your development environment running.
+
+> **Note:** You'll need **pnpm version 10 or higher**. If you're unsure which version you have, run `pnpm -v`.
+
+## Repository Overview
+
+```
+echo/
+├── packages/
+│   ├── laravel-echo/    Core library
+│   ├── react/           React hooks
+│   │   └── tests/       React tests
+│   └── vue/             Vue hooks
+│       └── tests/       Vue Tests
+```
+
+## Getting Started
+
+Clone the repository and install the dependencies:
+
+```sh
+git clone https://github.com/laravel/echo.git echo
+cd echo
+pnpm install
+```
+
+Then, start the development environment:
+
+```sh
+pnpm dev
+```
+
+This builds the core library and of the package variants, and starts a file watcher that will automatically rebuild each package when changes are made.
+
+If you prefer, you can also start individual watchers from each package directory. For example:
+
+```sh
+cd packages/laravel-echo && pnpm dev
+cd packages/react && pnpm dev
+cd packages/vue && pnpm dev
+```
+
+> **Note:** The core package (`packages/laravel-echo`) must always be running, as all adapters depend on it.
+
+## Running Tests
+
+Run all tests:
+
+```sh
+pnpm test
+```
+
+Run the test suite for a specific adapter:
+
+```sh
+cd packages/laravel-echo && pnpm test
+cd packages/react && pnpm test
+cd packages/vue && pnpm test
+```