What to do with my 'fake' device code

[andrewfg]

While writing the code for #4237 I needed a counterpart device to test the SDDP discovery functionality. Since I did not have a real such physical device I wrote a Java 'fake device' application that simulates a device which responds to SDDP SEARCH requests. This code may be useful in future, so I would like to make it available here. But strictly it is not part of the Junit test suite for #4237 so probably it should not be part of that module. => Is there any common repo (in OH) where such 'useful simulator code' could be stored?