diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000000000000000000000000000000000000..f862627a58633305eaddd7ded0fc5ac5c3f27112
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "community/cert"]
+	path = community/cert
+	url = https://github.com/cbluoss/rc3_tiles.git
diff --git a/community/cert b/community/cert
new file mode 160000
index 0000000000000000000000000000000000000000..4d9411fb7281e4f9c4830250df78a86c948fd204
--- /dev/null
+++ b/community/cert
@@ -0,0 +1 @@
+Subproject commit 4d9411fb7281e4f9c4830250df78a86c948fd204