Switch to cmake and fetch nlohmann::json

This will be used to dynamically set a label table

.gitignore

@@ -1,2 +1,3 @@
 out
 hack-assembler
+build

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)
+

README.md

@@ -2,11 +2,18 @@
 
 An implementation of a hack assembler in C++.
 
+## Compilation
+
+```bash
+cmake -S . -B build
+cmake --build build
+```
+
 ## Usage
 
 ```bash
 g++ -o hack-assembler main.cpp
-cat <input_file.asm> | ./hack-assembler > <output_file.hack>
+cat <input_file.asm> | ./hack-assembler > ./out/<output_file.hack>
 ```
 
 ## License