Remove obsolete INFORMATION_NEEDED.md and streamline README.md for clarity

- Deleted the INFORMATION_NEEDED.md file as it was no longer necessary for documentation.
- Revised README.md to enhance the overview of the home automation system, focusing on how services and CODESYS connectivity work.
- Updated project structure in README.md for better organization and clarity, including links to relevant documentation.

This update simplifies the documentation and improves the overall user experience for developers and users of the home automation system.

docs/integration/zigbee-to-nvl-function.js

@@ -0,0 +1,32 @@
+// Writes to state.rooms.cmd_livingroom (same as HA to NVL). Zigbee action → zigbee_sw1..6.
+const ROOM_NAME = 'cmd_livingroom';
+const actionToSwitch = { single: 1, double: 2, hold: 3, release: 4, triple: 5, quad: 6 };
+const payload = msg.payload || {};
+const actionRaw = (payload.action || payload.click || '').toLowerCase();
+// Support "1_single", "2_double" etc. (button_number + action) or plain "single", "double"
+const parts = actionRaw.split('_');
+let swIndex = null;
+if (parts.length >= 2) {
+  const buttonNum = parseInt(parts[0], 10);
+  if (buttonNum >= 1 && buttonNum <= 6) swIndex = buttonNum;
+}
+if (swIndex == null) swIndex = actionToSwitch[actionRaw];
+if (swIndex == null && parts.length >= 2) swIndex = actionToSwitch[parts.slice(1).join('_')];
+if (swIndex == null) swIndex = actionToSwitch[parts[parts.length - 1]];
+
+if (swIndex == null) {
+  node.warn('[Zigbee to NVL] unknown action: ' + JSON.stringify(actionRaw) + ' payload=' + JSON.stringify(payload));
+  return null;
+}
+
+if (!flow.get('nvlInState')) flow.set('nvlInState', { rooms: {}, boiler: {} });
+const state = flow.get('nvlInState');
+if (!state.rooms[ROOM_NAME]) state.rooms[ROOM_NAME] = {};
+state.rooms[ROOM_NAME]['zigbee_sw' + swIndex] = true;
+flow.set('nvlInState', state);
+
+node.warn('[Zigbee to NVL] cmd_livingroom zigbee_sw' + swIndex + '=true (action=' + actionRaw + '), buildAndSend + zigbeeClear');
+
+msg.payload = { buildAndSend: true };
+msg.zigbeeClear = { room: ROOM_NAME, key: 'zigbee_sw' + swIndex };
+return msg;