Merge pull request #52 from LisaFC/feature/docs

Objective-C quickstart

Author: LisaFC

_layouts/docs.html

@@ -22,6 +22,7 @@
       <li><a href="/docs/installation/ruby.html">Ruby</a></li>
       <li><a href="/docs/installation/node.html">Node.js</a></li>
       <li><a href="/docs/installation/csharp.html">C#</a></li>
+      <li><a href="/docs/installation/objective-c.html">Objective-C</a></li>
       <li><a href="/docs/installation/php.html">PHP</a></li>
       <li><h4>Tutorials</h4></li>
       <li><a href="/docs/tutorials/basic/c.html">gRPC Basics: C++</a></li>

docs/installation/objective-c.md

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+---
+layout: docs
+title: Objective-C Quick Start
+---
+
+<h1 class="page-header">gRPC in 3 minutes (Objective-C)</h1>
+
+This document shows you how to install and build an Objective-C client for a simple Hello World example, as used in the [Overview](/docs/index.shtml).
+
+## 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](https://github.com/grpc/grpc-common/blob/master/protos/helloworld.proto) example used in the [Overview](/docs/index.html).
+
+The example code for this and our other examples lives in the `grpc-common`
+GitHub repository. Clone this repository to your local machine by running the
+following command:
+
+
+````
+$ git clone https://github.com/grpc/grpc-common.git
+```
+
+Change your current directory to `grpc-common/objective-c/helloworld`
+
+````
+$ cd grpc-common/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++ `Greeter` server:
+
+```
+$ pushd ../../cpp/helloworld
+$ make
+$ ./greeter_server &
+$ popd
+```
+
+Now have Cocoapods generate and install the client library for our .proto files:
+
+```
+$ 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](/docs/tutorials/basic/objective-c.html).