add tcp connection class and example

examples/tcp_connection.js

@@ -0,0 +1,27 @@
+import TCPConnection from "../src/connection/tcp_connection.js";
+
+// create tcp connection
+const connection = new TCPConnection("10.1.0.226", 5000);
+
+// wait until connected
+connection.on("connected", async () => {
+
+    // we are now connected
+    console.log(`Connected to: [${connection.host}:${connection.port}]`);
+
+    // log contacts
+    const contacts = await connection.getContacts();
+    for(const contact of contacts) {
+        console.log(`Contact: ${contact.advName}`);
+    }
+
+    // send message to public channel
+    // await connection.sendChannelTextMessage(0, "test");
+
+    // disconnect
+    connection.close();
+
+});
+
+// connect to meshcore device
+await connection.connect();