Create README.md

Author: wu-ciesielska

README.md

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+# Node.js Express Dogs API
+
+This is a simple Node.js Express application that provides CRUD (Create, Read, Update, Delete) operations for managing dogs. It uses an in-memory array to store dog data. Each dog object includes properties such as `name`, `breed`, `age`, and `favoriteToy`.
+
+## Getting Started
+
+These instructions will help you get the project up and running on your local machine for development and testing purposes.
+
+### Prerequisites
+
+What things you need to install the software and how to install them:
+
+- Node.js
+- npm (Node Package Manager)
+
+### Installing
+
+A step-by-step series of examples that tell you how to get a development environment running:
+
+1. **Clone the repository:**
+   ```
+   git clone [repository_url]
+   ```
+
+2. **Navigate to the project directory:**
+    ```
+    cd [project_name]
+    ```
+
+3. **Install dependencies:**
+    ```
+    npm install
+    ```
+
+### Running the Application
+Run the application with the following command:
+```
+npm start
+```
+The server will start and listen for requests on http://localhost:3000.
+
+### Endpoints
+The application supports the following endpoints:
+
+- `GET /dogs`: Fetch all dogs.
+- `GET /dogs/:id`: Fetch a single dog by ID.
+- `POST /dogs`: Add a new dog.
+- `PUT /dogs/:id`: Update an existing dog by ID.
+- `DELETE /dogs/:id`: Delete a dog by ID.
+
+### Running Tests
+To run the automated tests for this system, use the following command:
+```
+npm test
+```
+
+### Built With
+- Node.js - The JavaScript runtime
+- Express - The web framework
+- Jest - The testing framework
+- Supertest - The library for testing HTTP