[Add] files for compilation

aidge_learning-config.cmake.in

+@PACKAGE_INIT@
+
+include(${CMAKE_CURRENT_LIST_DIR}/aidge_learning-config-version.cmake)
+
+include(${CMAKE_CURRENT_LIST_DIR}/aidge_learning-targets.cmake)

unit_tests/CMakeLists.txt

+Include(FetchContent)
+
+FetchContent_Declare(
+  Catch2
+  GIT_REPOSITORY https://github.com/catchorg/Catch2.git
+  GIT_TAG        v3.0.1 # or a later release
+)
+
+FetchContent_MakeAvailable(Catch2)
+
+file(GLOB_RECURSE src_files "*.cpp")
+
+add_executable(tests${module_name} ${src_files})
+
+target_link_libraries(tests${module_name} PUBLIC ${module_name})
+
+target_link_libraries(tests${module_name} PRIVATE Catch2::Catch2WithMain)
+
+list(APPEND CMAKE_MODULE_PATH ${catch2_SOURCE_DIR}/extras)
+include(CTest)
+include(Catch)
+catch_discover_tests(tests${module_name})