few more works towards the edurouter

only stubs by now.

SUMMARY.md

 # Summary
 
 * [da/net OER](README.md)
+    * [da/net edurouter](danetro/README.md)
     * [Managing Networks](manage-networks/README.md)
         * [Intro](manage-networks/Intro/README.md)
         * [Yang Models](manage-networks/yang-models/README.md)

danetro/README.md

+# The da/net edurouter (danetro)
+
+The da/net group uses a virtual machine with jails as educational environment for students to work with exercises around various network topics in our courses.
+
+The virtual machine environment is called the da/net edurouter, or short danetro.