Add README

clanServices/localsend/README.md

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+LocalSend is a free, open-source alternative to AirDrop that allows you to
+securely share files and messages with nearby devices over your local network
+without needing an internet connection.
+
+## Example Usage
+
+```nix
+inventory.instances = {
+  localsend = {
+    module = {
+      name = "localsend";
+      input = "clan";
+    };
+    roles.default.machines.draper = { };
+  };
+}
+```