feat: Initial commit of Yoto Up Covers web application

- Added main HTML file (index.html) for the web app interface.
- Created a sample cover template (sample_cover.html) for Yoto cards.
- Implemented a simple HTTP server (server.py) to serve the web app.
- Configured package.json for project metadata and scripts.

server.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python3
+"""
+Simple HTTP server to serve the Yoto Up Covers web app.
+Run this script and open http://localhost:8000 in your browser.
+"""
+
+import http.server
+import socketserver
+import os
+import sys
+from pathlib import Path
+
+# Change to the current directory (where the files are)
+web_app_dir = Path(__file__).parent
+os.chdir(web_app_dir)
+
+# Set up the server
+PORT = 8000
+
+class CustomHTTPRequestHandler(http.server.SimpleHTTPRequestHandler):
+    def end_headers(self):
+        # Add CORS headers to allow cross-origin requests
+        self.send_header('Access-Control-Allow-Origin', '*')
+        self.send_header('Access-Control-Allow-Methods', 'GET, POST, OPTIONS')
+        self.send_header('Access-Control-Allow-Headers', 'Content-Type')
+        super().end_headers()
+
+    def log_message(self, format, *args):
+        # Suppress server logs for cleaner output
+        return
+
+def main():
+    print("Yoto Up Covers Web App Server")
+    print("=" * 40)
+    print(f"Serving from: {web_app_dir.absolute()}")
+    print(f"Open your browser to: http://localhost:{PORT}")
+    print("Press Ctrl+C to stop the server")
+    print()
+
+    try:
+        with socketserver.TCPServer(("", PORT), CustomHTTPRequestHandler) as httpd:
+            httpd.serve_forever()
+    except KeyboardInterrupt:
+        print("\nServer stopped.")
+    except OSError as e:
+        if e.errno == 48:  # Address already in use
+            print(f"Error: Port {PORT} is already in use. Try a different port or stop the other server.")
+        else:
+            print(f"Error starting server: {e}")
+
+if __name__ == "__main__":
+    main()