feat: add nlohmann/json lib (#1552)

* feat: add nlohmann/json lib

* remove build test off

CMakeLists.txt

@@ -96,6 +96,7 @@ set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
 
 find_package(MariaDB)
+find_package(JSON)
 
 # Create a /resServer directory
 make_directory(${CMAKE_BINARY_DIR}/resServer)
@@ -284,7 +285,7 @@ add_subdirectory(dPhysics)
 add_subdirectory(dServer)
 
 # Create a list of common libraries shared between all binaries
-set(COMMON_LIBRARIES "dCommon" "dDatabase" "dNet" "raknet" "MariaDB::ConnCpp" "magic_enum")
+set(COMMON_LIBRARIES "dCommon" "dDatabase" "dNet" "raknet" "MariaDB::ConnCpp" "magic_enum" "nlohmann_json::nlohmann_json")
 
 # Add platform specific common libraries
 if(UNIX)

cmake/FindJSON.cmake

@@ -0,0 +1,20 @@
+include(FetchContent)
+
+message(STATUS "Fetching json...")
+
+FetchContent_Declare(
+	json
+	GIT_REPOSITORY https://github.com/nlohmann/json
+	GIT_TAG v3.11.3
+)
+
+FetchContent_GetProperties(json)
+if(NOT json_POPULATED)
+	FetchContent_Populate(json)
+	add_subdirectory(${json_SOURCE_DIR} ${json_BINARY_DIR} EXCLUDE_FROM_ALL)
+endif()
+
+FetchContent_MakeAvailable(json)
+
+message(STATUS "json fetched and is now ready.")
+set(JSON_FOUND TRUE)