Add the linux build instructions

Building-for-Linux.md

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+# Linux Build
+
+## Introduction
+---
+
+Dolphin runs on 64-bit Linux distributions. These instructions explain how to build Dolphin on Linux using the cmake build system.
+
+
+## Step 1 – Install the Correct Dependencies
+---
+
+**Ubuntu 12.04 and newer**  
+`sudo apt-get install cmake git g++ wx2.8-headers libwxbase2.8-dev libwxgtk2.8-dev libgtk2.0-dev libsdl1.2-dev libxrandr-dev libxext-dev libao-dev libasound2-dev libpulse-dev libbluetooth-dev libreadline-gplv2-dev libavcodec-dev libavformat-dev libswscale-dev`
+
+**Ubuntu 11.04**  
+`sudo apt-get install cmake git g++ wx2.8-headers libwxbase2.8-dev libwxgtk2.8-dev libgtk2.0-dev libsdl1.2-dev libxrandr-dev libxext-dev libao-dev libasound2-dev libpulse-dev libbluetooth-dev libreadline5-dev libavcodec-dev libavformat-dev libswscale-dev`
+
+**Other Linux versions**  
+See the [build dependencies](#build-dependencies) below for a list of packages you will need to install.
+
+## Step 2 – Get the Dolphin Repository
+---
+
+Get a local copy of the dolphin-emu repository:
+```bash
+git clone https://github.com/dolphin-emu/dolphin.git dolphin-emu
+```
+
+Change to the directory created:
+```bash
+cd dolphin-emu 
+```
+
+Later, if you wish to update your local copy:
+```bash
+git pull origin master
+```
+
+## Step 3 – Building Dolphin
+---
+
+Create a build subdirectory, and change into it:
+```bash
+mkdir Build && cd Build
+```
+
+Configure the build:
+```bash
+cmake ..
+```
+
+You may also want to change the install prefix by adding `-D CMAKE_INSTALL_PREFIX=/new/path`.
+Note that this path does not need to be absolute. cmake will complete it to its absolute equivalent.
+The default prefix is `/usr`. This means that the executable will be installed as `/usr/bin/dolphin-emu`, the plugins will be installed into `/usr/lib/dolphin-emu`, and the shared data files will be installed into `/usr/share/dolphin-emu`. 
+
+From here build and install in the standard make way: 
+```bash
+make && make install
+```
+
+Note that you may need superuser privileges for the last command. 
+
+
+## Step 4 – Run Dolphin!
+---
+
+You can run dolphin from anywhere by typing:
+
+`dolphin-emu`
+
+If you changed the prefix and `$prefix/bin` is not in your path, then you will have to precede this with the path to the executable.
+
+
+## FAQ
+---
+
+**Where can I get help?**  
+Go to the [forums](http://forums.dolphin-emu.org/). Lots of Dolphin users use Linux, and they are very experienced with this process.
+
+**My build failed, but I did nothing wrong!**  
+Most of the time, any problems in the build process are due to user error. It's understandable, it is a complicated process and can be quite daunting for a first timer. But sometimes even with everything right, triple checked, and it's still not working. It's rare, but sometimes a build will just be bugged. But many of Dolphin devs are Linux users, so just wait a day or so, and it will be sorted out. 
+
+
+## Build Dependencies
+---
+
+- git
+- cmake
+- g++
+- wx2.9-headers (wx3.0-headers work too, and are perhaps preferred!)
+- libwxbase2.8-dev
+- libwxgtk2.8-dev
+- libgtk2.0-dev
+- libbluetooth-dev (optional, for real Wiimotes)
+- libxrandr-dev (optional, for switching desktop resolution in fullscreen mode)
+- libxext-dev
+- libreadline-dev
+- libasound-dev (optional, for ALSA sound backend)
+- libpulse-dev (optional, for PulseAudio sound backend)
+- libao-dev (optional, for AO sound backend)
+- libopenal-dev (optional, for OpenAL sound backend)
+- libavcodec-dev (optional, for dumping frames in AVI format)
+- libavformat-dev (optional, for dumping frames in AVI format)
+- libswscale-dev (optional, for dumping frames in AVI format)
+- liblzo2-dev (optional, if not found will be built statically)
+- libsdl1.2-dev (optional, if not found will be built statically)
+- libsoil-dev (optional, if not found will be built statically)
+- libsfml-dev (optional, if not found will be built statically)