docs: update README with usage example and nginx config detail

README.md

@@ -60,7 +60,7 @@ Stopping and restarting the application preserves all task data thanks to this v
 - **Port:** 80 (host) -> 80 (container)
 - **Role:** Serves static HTML/CSS/JS files and reverse-proxies `/api/*` requests to the Flask backend
 - **Restart policy:** `unless-stopped`
-- **Configuration:** Custom `nginx.conf` with `proxy_pass` directive for API routing
+- **Configuration:** Custom `nginx.conf` with `proxy_pass` directive for API routing and `large_client_header_buffers 4 32k` for handling large cookies
 
 ### 2. taskapp-flask (Backend)
 
@@ -184,6 +184,51 @@ docker compose down -v --rmi all
 └── README.md               # This file
 ```
 
+## Example of Working with the Application
+
+```bash
+# Prepare everything needed for the application
+./prepare-app.sh
+# Output:
+# Preparing app...
+# Building backend image...
+# Building frontend image...
+# Creating network...
+# Creating volume...
+# App prepared successfully.
+
+# Start the application
+./start-app.sh
+# Output:
+# Starting app...
+# Starting database...
+# Starting backend...
+# Starting frontend...
+#
+# App is running!
+# The app is available at http://localhost:80
+
+# Open web browser and work with the application at http://localhost:80
+# - Add tasks using the input field
+# - Mark tasks as completed by clicking the checkbox
+# - Delete tasks by clicking the X button
+
+# Stop the application (data is preserved)
+./stop-app.sh
+# Output:
+# Stopping app...
+# App stopped.
+
+# Start again - all tasks are still there
+./start-app.sh
+
+# Remove everything related to the application
+./remove-app.sh
+# Output:
+# Removing app...
+# App removed.
+```
+
 ## Sources
 
 - [Docker Documentation](https://docs.docker.com/)