Added animation_curve to the examples in CMake (#336)

projects/CMake/CMakeLists.txt

@@ -31,6 +31,7 @@ if(${BUILD_RAYGUI_EXAMPLES})
 
     # Get the sources together
     set(example_dirs
+        animation_curve
         controls_test_suite
         custom_file_dialog
         custom_sliders
@@ -72,4 +73,4 @@ if(${BUILD_RAYGUI_EXAMPLES})
 
     # Copy all of the resource files to the destination
     file(COPY ${example_resources} DESTINATION "resources/")
-endif()
+endif()