Create Multi-LND-Node-setup.md

docs/Multi-LND-Node-setup.md

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+#### Directions for setting up RTL to connect with and manage multiple LND nodes
+
+Caution: This feature is for advanced users, running multiple LND nodes.
+
+A single server instance of RTL can be used to connect with multiple LND nodes on the same network. Configuring RTL for this requires the following steps:
+1. Update lnd.conf of LND to enable remote connections and restart LND
+2. Configure 'RTL-Multi-Node-Conf.json' with individual entries for each LND node
+3. Restart RTL
+4. Run RTL and switch LND nodes live via settings
+
+##### Update lnd.conf
+
+##### Configure 'RTL-Multi-Node-Conf.json'
+
+##### Restart RTL
+
+##### Run RTL and switch LND nodes in the UI