Add example for data-mesher service usage

clanServices/data-mesher/README.md

@@ -1,10 +1,29 @@
----
+This service will set up data-mesher.
-description = "Set up data-mesher"
-categories = ["System"]
-features = [ "inventory" ]
 
-[constraints]
+## Usage
-roles.admin.min = 1
-roles.admin.max = 1
----
 
+```nix
+inventory.instances = {
+  data-mesher = {
+    module = {
+      name = "data-mesher";
+      input = "clan-core";
+    };
+    roles.admin.machines.server0 = {
+      settings = {
+        bootstrapNodes = {
+          node1 = "192.168.1.1:7946";
+          node2 = "192.168.1.2:7946";
+        };
+
+        network = {
+          hostTTL = "24h";
+          interface = "tailscale0";
+        };
+      };
+    };
+    roles.peer.machines.server1 = { };
+    roles.signer.machines.server2 = { };
+  };
+}
+```