Created Build (markdown)

Build.md

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+## Ubuntu (Debian-based distros)
+```
+sudo apt-get install git build-essential cmake libuv1-dev
+git clone https://github.com/xmrig/xmrig.git
+cd xmrig
+mkdir build
+cd build
+cmake .. -DCMAKE_BUILD_TYPE=Release
+make
+```
+### gcc 7.1
+```
+sudo add-apt-repository ppa:jonathonf/gcc-7.1
+sudo apt-get update
+apt-get install gcc-7 g++-7
+```
+When run cmake manually specify C and C++ compiler:
+```
+cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=/usr/bin/gcc-7 -DCMAKE_CXX_COMPILER=/usr/bin/g++-7
+```
+
+## Windows
+There two options Microsoft Visual Studio 2015+ or [MSYS2](http://www.msys2.org/) both required [libuv](https://github.com/libuv/libuv) build and cmake.
+
+### MSYS2
+Necessary MSYS2 packages:
+```
+pacman -Sy
+pacman -S mingw-w64-x86_64-gcc
+pacman -S make
+pacman -S mingw-w64-x86_64-cmake
+pacman -S mingw-w64-x86_64-pkg-config
+```
+CMake build:
+```
+cmake .. -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release -DUV_INCLUDE_DIR="c:\<path>\libuv\include" -DUV_LIBRARY="c:\<path>\libuv\.libs\libuv.a"
+make
+```
+
+### Microsoft Visual Studio
+```
+`cmake .. -G "Visual Studio 14 2015 Win64" -T v140_xp -DCMAKE_BUILD_TYPE=Release -DUV_INCLUDE_DIR=c:\<path>\libuv\include -DUV_LIBRARY=c:\<path>\libuv\Release\lib\libuv.lib`
+```
+
+## Optional features
+
+* `-DWITH_LIBCPUID=OFF` Disable libcpuid. Auto configuration of CPU after this will be very limited.
+* `-DWITH_AEON=OFF` Disable CryptoNight-Lite support.