I downloaded securesocial-master.zip from https://github.com/jaliss/securesocial/tree/master
1.After extracting, change directory
cd C:\\Users\\ffffd\\
According to you input information:
C:\Users\ffffd\play\securesocial-master
2.run activator from the root directory
C:\Users\ffffd\play\securesocial-master\activator
3.type command project and press TAB key, ane you can choose demo:
> project javaDemo
4.Run this demo
[java-demo] $ run
result
(Server started, use Ctrl+D to stop and go back to the console...)
P.S.
use help for more details
[java-demo] $ help project