diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..e112e4c
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "backend"]
+	path = backend
+	url = https://zhi:rT5Wjw24mV4all38fIoNQfl2@git.hangman-lab.top/zhi/HarborForge.Backend.git
diff --git a/backend b/backend
new file mode 160000
index 0000000..fee2320
--- /dev/null
+++ b/backend
@@ -0,0 +1 @@
+Subproject commit fee2320cee5736ddbeeb9eae8e62a2c31610cb47