CMake: add CMake scaffolding

cmake/find_dependencies.cmake

@@ -0,0 +1,69 @@
+include(FetchContent)
+
+find_package(RaychelLogger QUIET)
+
+if(NOT RaychelLogger_FOUND)
+
+    message(STATUS "Could not find a local installation of RaychelLogger, using version off GitHub...")
+
+    FetchContent_Declare(RAYCHEL_LOGGER
+        GIT_REPOSITORY "https://github.com/Weckyy702/RaychelLogger"
+        GIT_TAG "main"
+    )
+
+    FetchContent_MakeAvailable(RAYCHEL_LOGGER)
+
+    set(RAYCHEL_LOGGER_EXTERNAL true)
+
+endif()
+
+find_package(RaychelCore QUIET)
+
+if(NOT RaychelCore_FOUND)
+
+    message(STATUS "Could not find a local installation of RaychelCore, using version off GitHub...")
+    FetchContent_Declare(RAYCHEL_CORE
+        GIT_REPOSITORY "https://github.com/Weckyy702/RaychelCore"
+        GIT_TAG "main"
+    )
+
+    FetchContent_MakeAvailable(RAYCHEL_CORE)
+
+    set(RAYCHEL_CORE_EXTERNAL true)
+
+endif()
+
+find_package(RaychelMath QUIET)
+
+if(NOT RaychelMath_FOUND)
+
+    message(STATUS "Could not find a local installation of RaychelMath, using version off GitHub...")
+    FetchContent_Declare(RAYCHEL_MATH
+        GIT_REPOSITORY "https://github.com/Weckyy702/RaychelMath"
+        GIT_TAG "main"
+    )
+
+    FetchContent_MakeAvailable(RAYCHEL_MATH)
+
+    set(RAYCHEL_MATH_EXTERNAL true)
+
+endif()
+
+if(RAYCHEL_BUILD_TESTS)
+
+    find_package(Catch2 QUIET)
+
+    if(NOT Catch2_FOUND)
+        message(STATUS "Could not find a local installation of Catch2, using version off GitHub...")
+    endif()
+
+    FetchContent_Declare(CATCH_2
+        GIT_REPOSITORY "https://github.com/catchorg/Catch2"
+        GIT_TAG "v2.13.8"
+    )
+
+    FetchContent_MakeAvailable(CATCH_2)
+
+    set(CATCH_2_EXTERNAL true)
+
+endif()