add INSTALL

INSTALL.md

@@ -0,0 +1,34 @@
+Installation
+------------
+
+### Linux / macOS
+
+If you do not care about build options, simply run
+```sh
+make
+```
+in Terminal.
+
+If you would like to customize build options, follow the below procedure:
+```sh
+mkdir build
+cd build
+cmake .. -DCMAKE_BUILD_TYPE=Release [OPTIONS]
+make -j 4 install
+```
+
+### Windows
+
+If you do not care about build options, simply run
+```sh
+make.bat
+```
+in DOS prompt.
+
+If you would like to customize build option, follow the below procedure:
+```sh
+mkdir build
+cd build
+cmake .. [OPTIONS]
+MSBuild -maxcpucount:4 /p:Configuration=Release INSTALL.vcxproj
+```