[TS] Moves grpc code to examples folder (#6476)

Adds readme

grpc/examples/ts/greeter/src/client.ts

@@ -0,0 +1,34 @@
+import grpc from 'grpc';
+import { HelloReply } from './models/hello-reply';
+import { HelloRequest } from './models/hello-request';
+import { GreeterClient } from './greeter_grpc';
+import { flatbuffers } from 'flatbuffers';
+
+async function main(PORT: Number, name: String) {
+    const _server = new GreeterClient(`localhost:${PORT}`, grpc.credentials.createInsecure());
+    const builder = new flatbuffers.Builder();
+    const offset = builder.createString(name);
+    const root = HelloRequest.createHelloRequest(builder, offset);
+    builder.finish(root);
+    const buffer = HelloRequest.getRootAsHelloRequest(new flatbuffers.ByteBuffer(builder.asUint8Array()));
+
+    _server.SayHello(buffer, (err, response) => {
+        console.log(response.message());
+    });
+
+    const data = _server.SayManyHellos(buffer, null);
+
+    data.on('data', (data) => {
+        console.log(data.message());
+    });
+}
+
+const args = process.argv.slice(2)
+const PORT = Number(args[0]);
+const name = String(args[1] ?? "flatbuffers");
+
+if (PORT) {
+    main(PORT, name);
+} else {
+    throw new Error("Requires a valid port number.")
+}