added Windows batch script to install python wrapped package

cython/scripts/install.bat

@@ -0,0 +1,18 @@
+:: This script runs the installation flow for python wrapped GTSAM.
+:: It does so by running `python setup.py install` to install the wrapped package.
+
+echo "Installing GTSAM Python Wrapper"
+
+:: Set the package path
+PACKAGE_PATH=${GTSAM_CYTHON_INSTALL_PATH}${GTSAM_BUILD_TAG}
+
+:: Check if package directory exists. If not, print warning and exit.
+if [ ! -d "$PACKAGE_PATH" ]
+then
+    echo "Directory $PACKAGE_PATH DOES NOT exist. Please run 'make install' first.";
+    exit 1;
+fi
+
+:: Run setup.py install with full paths.
+echo "Running setup.py in $PACKAGE_PATH"
+${PYTHON_EXECUTABLE} $PACKAGE_PATH/setup.py install