Add daemon submodule and Docker support

Update .gitignore and README.md
Add .gitreview file

Change-Id: If4800ae668ecc38cf64bfca540c6f0731541fb42
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..6a5bb30
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "jami-daemon"]
+	path = daemon
+	url = https://review.jami.net/jami-daemon