diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..b2d3944
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,9 @@
+[submodule "mainstream-contracts"]
+	path = mainstream-contracts
+	url = git@github.com:brotherday/mainstream-contracts.git
+[submodule "mainstream-backend"]
+	path = mainstream-backend
+	url = git@github.com:brotherday/mainstream-backend.git
+[submodule "mainstream-frontend"]
+	path = mainstream-frontend
+	url = git@github.com:brotherday/mainstream-frontend.git
diff --git a/mainstream-backend b/mainstream-backend
new file mode 160000
index 0000000..bb83ba0
--- /dev/null
+++ b/mainstream-backend
@@ -0,0 +1 @@
+Subproject commit bb83ba07e08e092892f1f34c4f16d648fc6ca7ee
diff --git a/mainstream-contracts b/mainstream-contracts
new file mode 160000
index 0000000..8038e81
--- /dev/null
+++ b/mainstream-contracts
@@ -0,0 +1 @@
+Subproject commit 8038e81041e670553df998ed2aed4282198f93e4
diff --git a/mainstream-frontend b/mainstream-frontend
new file mode 160000
index 0000000..a58f6cf
--- /dev/null
+++ b/mainstream-frontend
@@ -0,0 +1 @@
+Subproject commit a58f6cfd1f95e93f1babba00e6dc28c83a23d249