Add example video mappings file with decimal card ID format

video_mappings.example.json

@@ -0,0 +1,14 @@
+{
+  "_comment": "Map NFC Card IDs (decimal) to video paths",
+  "_format": "Card IDs are the 10-digit numbers shown by standard NFC readers",
+  "_example_uid": "UID 042B603A9A4080 -> Card ID 983187584",
+  
+  "983187584": "videos/example_video.mp4",
+  
+  "_instructions": [
+    "1. Place a tag on the portal",
+    "2. Note the 'NFC Card ID' displayed in the console", 
+    "3. Add an entry: \"CARD_ID\": \"path/to/video.mp4\"",
+    "4. Restart the integration client"
+  ]
+}