Update README.md

README.md

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-# meshtastic2skylines
-Forward position to skylines to live track your flying machine on skylines, flyxc.app, puretrack.io etc
+# Meshtastic2skylines Node-RED Flow
+
+## Overview
+
+This Node-RED flow is designed to forward position data to [https://skylines.aero](https://skylines.aero) using data from an MQTT broker. It includes functionalities to ingest data from MQTT, decode the incoming packets, deduplicate packets, and send position measurements to Skylines via HTTP POST requests.
+
+## Subflows
+
+### Ingest from MQTT
+This subflow handles the ingestion of data from MQTT. It subscribes to all topics ("#") with a quality of service (QoS) of 2. If you do not want to forward data to mqtt.meshtastic.org, disable the connection from the MQTT In node to the MQTT Out node.
+
+### Measurement: Position
+This subflow is responsible for generating position measurements from the decoded packet data. It converts latitude, longitude, altitude, time, satellites in view, ground speed, and ground track into a structured payload suitable for storage or further processing.
+
+### Filtercrap (Function)
+This function node filters out invalid messages and adds types to valid messages. It checks for valid latitude and longitude values in the payload.
+
+### Generate Position Measurement (Function)
+This function node generates position measurements from the decoded packet payload. It calculates session IDs and prepares data for HTTP POST requests to Skylines.
+
+### HTTP Request (HTTP Request)
+This node sends HTTP POST requests to https://skylines.aero with the position measurement data.
+
+### Debug Nodes
+Debug nodes are included for debugging purposes. They can be activated or deactivated as needed.
+
+## Additional Information
+- **mqtt in and out**: Modify to point to your mqtt server in Ingest subflow. Disable link to mqtt out if you do not wish to forward to mqtt.meshtastic.org.
+- **Skylines Integration**: Ensure that the user mapping is correctly set in the "toskylines" function to map user IDs to session IDs for Skylines integration. Update the `userConfig` object with your own device IDs and Skylines tracking IDs.
+```javascript
+// Define a configuration object mapping user IDs to session IDs
+var userConfig = {
+    "!YOURDEVICE1": "SLTRACKINGID1",
+    "!YOURDEVICE2": "SLTRACKINGID2"
+};
+```
+
+For more information about Skylines, visit [Skylines GitHub Repository](https://github.com/skylines/aero).
+
+**Dependencies**: This flow utilizes the Meshtastic Node-RED contrib nodes. For installation and usage instructions, refer to [Meshtastic Node-RED contrib](https://flows.nodered.org/node/@meshtastic/node-red-contrib-meshtastic) on Node-RED flows.
+
+**Based on**: This flow is based on the Meshtastic Node-RED contrib nodes. For more information and updates, see [Meshtastic Node-RED contrib GitHub repository](https://github.com/scruplelesswizard/meshtastic-node-red).
+
+Ensure all necessary dependencies are installed and configured properly in your Node-RED environment.
+
+**Acknowledgement**: Special thanks to ChatGPT for being fantastic!