build: add daemon submodule

GitLab: #38

Change-Id: If5ed42e53161d841492d47bd098d75555dba8adc
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..56673e7
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "daemon"]
+	path = daemon
+	url = https://review.jami.net/jami-daemon