Feature/docker support (#4)

* feat: Add Docker support for the application

This commit introduces comprehensive Docker support to streamline the development and deployment process.

Key changes include:
- A `Dockerfile` that containerizes the application using the efficient `node:20-alpine` base image. It sets up the working directory, installs dependencies, and configures the application to run on container start.
- A `.dockerignore` file to exclude unnecessary files like `node_modules` and `.git` from the build context, resulting in a smaller and more secure image.
- A `docker-compose.yml` file to simplify running the application. It defines the service, manages environment variables with sensible defaults, maps ports, and configures named volumes for `sessions` and `uploads` to ensure data persistence across container restarts.
- The `README.md` has been updated with a new "Running with Docker" section, providing clear, step-by-step instructions for getting the application running with both Docker Compose (recommended) and manual Docker commands. The commands have been updated to use the modern `docker compose` syntax.

* feat: Add Docker support for the application

This commit introduces comprehensive Docker support to streamline the development and deployment process.

Key changes include:
- A `Dockerfile` that containerizes the application using the efficient `node:20-alpine` base image. It sets up the working directory, installs dependencies, and configures the application to run on container start.
- A `.dockerignore` file to exclude unnecessary files like `node_modules` and `.git` from the build context, resulting in a smaller and more secure image.
- A `docker-compose.yml` file to simplify running the application. It defines the service, manages environment variables with sensible defaults, maps ports, and configures named volumes for `sessions` and `uploads` to ensure data persistence across container restarts.
- The `README.md` has been updated with a new "Running with Docker" section, providing clear, step-by-step instructions for getting the application running with Docker Compose, a pre-built Docker Hub image, and manual Docker commands. The commands have been updated to use the modern `docker compose` syntax.

---------

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

Author: Codegres-com

README.md

@@ -86,7 +86,31 @@ This is the easiest way to get started.
     docker compose down
     ```
 
-### **2. Using Docker (Manual)**
+### **2. Using the Pre-built Docker Hub Image**
+
+If you don't want to build the image from the source, you can use the pre-built image from Docker Hub.
+
+1.  **Pull the Image**:
+    ```bash
+    docker pull codegres/simple-whatsapp-api:latest
+    ```
+
+2.  **Run the Image**:
+    You still need to provide the environment variables and mount the volumes.
+
+    ```bash
+    docker run -d \
+      -p 3000:3000 \
+      -e MASTER_API_KEY="yoursecretkey" \
+      -e PORT="3000" \
+      --name whatsapp-api-container \
+      -v whatsapp_sessions:/usr/src/app/sessions \
+      -v whatsapp_uploads:/usr/src/app/uploads \
+      codegres/simple-whatsapp-api:latest
+    ```
+
+### **3. Using Docker (Manual Build)**
+
 
 If you prefer not to use Docker Compose, you can build and run the container manually.