mutation proof of concept

client can now send mutations and server properly executes them
TODO: implement query execution, add auth, add storage

example/client/index.ts

@@ -1,8 +1,21 @@
 import { TetherClient } from "tether-ts";
+import { createInterface } from "node:readline/promises";
 
 const client = new TetherClient();
 client.connect("ws://localhost:8080/tether");
 
-client.subscribe("messages", (message) => {
+client.subscribe("messages", { room: "1" }, (message) => {
 	console.log("Received message", message);
-});
+});
+
+const rl = createInterface({
+  input: process.stdin,
+  output: process.stdout,
+});
+
+while (true) {
+  const message = await rl.question("Enter a message");
+  if (message) {
+    client.sendMutation("createMessage", { room: "1", message: message });
+  }
+}