diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..5530f41
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "Convention/[nlohmann]"]
+	path = Convention/[nlohmann]
+	url = https://github.com/nlohmann/json.git
diff --git a/Convention/[nlohmann] b/Convention/[nlohmann]
new file mode 160000
index 0000000..d33ecd3
--- /dev/null
+++ b/Convention/[nlohmann]
@@ -0,0 +1 @@
+Subproject commit d33ecd3f3bd11e30aa8bbabb00e0a9cd3f2456d8