Switch to cmake and fetch nlohmann::json

This will be used to dynamically set a label table

CMakeLists.txt

@@ -0,0 +1,26 @@
+cmake_minimum_required(VERSION 3.18)
+set(NAME "hack-assembly")
+project(${NAME} CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+include(FetchContent)
+
+# nlohmann::json
+FetchContent_Declare(
+  json
+  GIT_REPOSITORY https://github.com/nlohmann/json.git
+  GIT_TAG v3.11.3
+)
+FetchContent_MakeAvailable(json)
+
+
+set(SRC_CXX_FILES "./main.cpp")
+
+add_executable(${NAME} ${SRC_CXX_FILES})
+
+target_link_libraries(${NAME} PUBLIC nlohmann_json::nlohmann_json)
+