diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..719ddb0
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "planning/abstract"]
+	path = planning/abstract
+	url = https://git@git.overleaf.com/682b876324b7af152d09f27a
diff --git a/planning/abstract b/planning/abstract
new file mode 160000
index 0000000..7c122c3
--- /dev/null
+++ b/planning/abstract
@@ -0,0 +1 @@
+Subproject commit 7c122c353293b6a6e8ac08a7e83e59cb41130ae5