Path prepended to CMAKE_MODULE_PATH was not enclosed with quotes.

This might cause problems when building on Windows platforms. Fixed.

Signed-off-by: Jupp Tscheak <jupp.tscheak@daimler.com>

CMakeLists.txt

@@ -11,7 +11,7 @@
 cmake_minimum_required(VERSION 3.14.0 FATAL_ERROR)
 
 # Add the custom CMake modules to CMake's module path
-list(PREPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR}/cmake)
+list(PREPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")
 
 project(
   ScenarioAPI