MM-42 README setup instructions for linux (#75)

README.md

@@ -6,3 +6,44 @@ It's written in JavaScript using React Native.
 
 # Installing Dependencies
 Follow the [React Native Getting Started Guide](https://facebook.github.io/react-native/docs/getting-started.html) for detailed instructions on setting up your local machine for development.
+
+# Detailed configuration:
+
+## Linux:
+
+- General requiriments:
+
+  - JDK 7 or greater
+  - Android SDK
+  - Virtualbox
+  - An Android emulator: Genymotion or Android emulator. If using genymotion ensure that it uses existing adb tools (Settings: "Use custom Android SDK Tools")
+  - Install watchman (do this globally):
+      $ git clone https://github.com/facebook/watchman.git
+      $ cd watchman
+      $ git checkout master
+      $ ./autogen.sh
+      $ ./configure make
+      $ sudo make install
+      Configure your kernel to accept a lot of file watches, using a command like:
+      $ sudo sysctl -w fs.inotify.max_user_watches=1048576
+
+- Clone repository and configure:
+    $ git clone git@github.com:mattermost/mattermost-mobile.git
+    $ cd mattermost-mobile
+    $ npm install
+    $ npm install -g react-native-cli
+
+  - Add or edit file `src/config/config.secret.json` and add the url to the Mattermost server that you will use to develop:
+    `{
+       "DefaultServerUrl": "https://pre-release.mattermost.com"
+    }`
+
+    To use a local Mattermost server you will need to configure the "DefaultServerUrl" depending on the emulator you will use:
+      IOs:        "DefaultServerUrl": "http://localhost:8065"
+      Android:    "DefaultServerUrl": "http://10.0.2.2:3000"
+      Genymotion: "DefaultServerUrl": "http://10.0.3.2:8065"
+
+- Run application
+  - Start emulator
+  - Start react packager: `$ react-native start`
+  - Run in emulator: `$ react-native run-android`