README.md: add example configuration

README.md

@@ -2,7 +2,12 @@
 
 ![conky-disks screenshot](https://github.com/neingeist/conky-gadgets/raw/master/doc/conky-disks-screenshot.png)
 
+    ${color #ffcb48}DISK$color
+    ${execpi 29 devel/conky-gadgets/conky-disks}
+
 **conky-fedora-kernel** – remind the user to boot a new kernel (Fedora)
 
 ![conky-fedora-kernel screenshot](https://github.com/neingeist/conky-gadgets/raw/master/doc/conky-fedora-kernel-screenshot.png)
 
+    ${execpi 1800 devel/conky-gadgets/conky-fedora-kernel}
+