Initial checkin of gRPC to third_party/

third_party/grpc/examples/objective-c/helloworld/README.md

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+#gRPC in 3 minutes (Objective-C)
+
+## Installation
+
+To run this example you should have [Cocoapods](https://cocoapods.org/#install) installed, as well
+as the relevant tools to generate the client library code (and a server in another language, for
+testing). You can obtain the latter by following [these setup instructions](https://github.com/grpc/homebrew-grpc).
+
+## Hello Objective-C gRPC!
+
+Here's how to build and run the Objective-C implementation of the [Hello World](../../protos/helloworld.proto)
+example used in [Getting started](https://github.com/grpc/grpc/tree/master/examples).
+
+The example code for this and our other examples lives in the `examples` directory. Clone
+this repository to your local machine by running the following commands:
+
+
+```sh
+$ git clone https://github.com/grpc/grpc.git
+$ cd grpc
+$ git submodule update --init
+```
+
+Change your current directory to `examples/objective-c/helloworld`
+
+```sh
+$ cd examples/objective-c/helloworld
+```
+
+### Try it!
+To try the sample app, we need a gRPC server running locally. Let's compile and run, for example,
+the C++ server in this repository:
+
+```shell
+$ pushd ../../cpp/helloworld
+$ make
+$ ./greeter_server &
+$ popd
+```
+
+Now have Cocoapods generate and install the client library for our .proto files:
+
+```shell
+$ pod install
+```
+
+(This might have to compile OpenSSL, which takes around 15 minutes if Cocoapods doesn't have it yet
+on your computer's cache.)
+
+Finally, open the XCode workspace created by Cocoapods, and run the app. You can check the calling
+code in `main.m` and see the results in XCode's log console.
+
+The code sends a `HLWHelloRequest` containing the string "Objective-C" to a local server. The server
+responds with a `HLWHelloResponse`, which contains a string that is then output to the log.
+
+## Tutorial
+
+You can find a more detailed tutorial in [gRPC Basics: Objective-C](http://www.grpc.io/docs/tutorials/basic/objective-c.html).