Imported Ord method, and added a simple test

Test/CMakeLists.txt

@@ -0,0 +1,17 @@
+cmake_minimum_required(VERSION 3.16)
+project(Test)
+
+set(CMAKE_CXX_STANDARD 17)
+
+include_directories(../Src)
+link_directories(../Src/cmake-build-debug)
+
+add_executable(Test
+        Catch2.h
+        main.cpp
+
+        Ord.cpp
+)
+
+target_link_libraries(Test GeneralUtility)
+