Added freeglut bat file

3rdparty/windows/getFreeglut.bat

+:: Avoid printing all the comments in the Windows cmd
+@echo off
+
+SET UNZIP_EXE=unzip\unzip.exe
+SET WGET_EXE=wget\wget.exe
+
+:: Download temporary zip
+echo ----- Downloading Caffe -----
+SET FREEGLUT_FOLDER=caffe\
+SET ZIP_NAME=freeglut_2018_01_14.zip
+SET ZIP_FULL_PATH=%FREEGLUT_FOLDER%%ZIP_NAME%
+%WGET_EXE% -c http://posefs1.perception.cs.cmu.edu/OpenPose/3rdparty/windows/%ZIP_NAME% -P %FREEGLUT_FOLDER%
+echo:
+
+echo ----- Unzipping Caffe -----
+%UNZIP_EXE% %ZIP_FULL_PATH%
+echo:
+
+echo ----- Deleting Temporary Zip File %ZIP_FULL_PATH% -----
+del "%ZIP_FULL_PATH%"
+
+echo ----- Caffe Downloaded and Unzipped -----