Created Building for Ubuntu 16.04 (markdown)

Building-for-Ubuntu-16.04.md

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+These instructions also apply for related distributions based on this Ubuntu LTS version.
+
+## Step 1: Prerequisites
+
+### cmake
+
+The following instructions install `cmake` to `~/cmake`:
+
+    wget https://cmake.org/files/v3.9/cmake-3.9.0-Linux-x86_64.sh
+    sh cmake-3.9.0-Linux-x86_64.sh --prefix=$HOME/cmake
+
+### Other prerequisites
+
+    sudo apt-get install build-essential git libcurl4-openssl-dev libqt5opengl5-dev libsdl2-dev libssl-dev qtbase5-dev wget xorg-dev
+
+## Step 2: Build Citra
+
+### Get Citra
+
+    git clone --recursive https://github.com/citra-emu/citra
+
+### Compile
+
+    cd citra
+
+    mkdir build
+    cd build
+
+    export CC=gcc-5
+    export CXX=g++-5
+    export PATH=$HOME/cmake/cmake-3.9.0-Linux-x86_64/bin:$PATH
+
+    cmake .. -DCMAKE_BUILD_TYPE=Release
+    make
+
+## Step 3: Run Citra
+
+    ./src/citra_qt/citra-qt