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

Adds readme

grpc/examples/ts/greeter/src/greeter_grpc.js

@@ -0,0 +1,56 @@
+// Generated GRPC code for FlatBuffers TS *** DO NOT EDIT ***
+import { flatbuffers } from 'flatbuffers';
+import { HelloReply as models_HelloReply } from './models/hello-reply';
+import { HelloRequest as models_HelloRequest } from './models/hello-request';
+
+var grpc = require('grpc');
+
+function serialize_models_HelloReply(buffer_args) {
+  if (!(buffer_args instanceof models_HelloReply)) {
+    throw new Error('Expected argument of type HelloReply');
+  }
+  return buffer_args.serialize();
+}
+
+function deserialize_models_HelloReply(buffer) {
+  return models_HelloReply.getRootAsHelloReply(new flatbuffers.ByteBuffer(buffer))
+}
+
+
+function serialize_models_HelloRequest(buffer_args) {
+  if (!(buffer_args instanceof models_HelloRequest)) {
+    throw new Error('Expected argument of type HelloRequest');
+  }
+  return buffer_args.serialize();
+}
+
+function deserialize_models_HelloRequest(buffer) {
+  return models_HelloRequest.getRootAsHelloRequest(new flatbuffers.ByteBuffer(buffer))
+}
+
+
+var GreeterService = exports.GreeterService = {
+  SayHello: {
+    path: '/models.Greeter/SayHello',
+    requestStream: false,
+    responseStream: false,
+    requestType: flatbuffers.ByteBuffer,
+    responseType: models_HelloReply,
+    requestSerialize: serialize_models_HelloRequest,
+    requestDeserialize: deserialize_models_HelloRequest,
+    responseSerialize: serialize_models_HelloReply,
+    responseDeserialize: deserialize_models_HelloReply,
+  },
+  SayManyHellos: {
+    path: '/models.Greeter/SayManyHellos',
+    requestStream: false,
+    responseStream: true,
+    requestType: flatbuffers.ByteBuffer,
+    responseType: models_HelloReply,
+    requestSerialize: serialize_models_HelloRequest,
+    requestDeserialize: deserialize_models_HelloRequest,
+    responseSerialize: serialize_models_HelloReply,
+    responseDeserialize: deserialize_models_HelloReply,
+  },
+};
+exports.GreeterClient = grpc.makeGenericClientConstructor(GreeterService);