Add first version of README.md

README.md

+--------------
+Dependencies
+--------------
+Boost (developped with 1.68)
+CMake >= 3.1
+LeapMotion SDK
+LeapMotion drivers
+Qt5
+
+--------------
+Compile intstructions
+--------------
+For GNU/Linux:
+
+Release:
+$ mkdir -p build
+$ cd build/
+$ cmake ..
+$ make -j$(nproc)
+
+Debug:
+$ mkdir -p buildDebug
+$ cd buildDebug/
+$ cmake ..
+$ make -j$(nproc)