Merge pull request #5876 from timthelion/docs-daemon-readme

Add readme for daemon directory

daemon/README.md

@@ -0,0 +1,10 @@
+This directory contains code pertaining to running containers and storing images
+
+Code pertaining to running containers:
+
+ - execdriver
+ - networkdriver
+
+Code pertaining to storing images:
+
+ - graphdriver