doc/server.md add information for adding software

See #3356
1 job for more_docker_docs in 5 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test Tools
failed #183059
test_tools

00:00:05

 
Name Stage Failure
failed
test_tools Test Tools
HTTP request sent, awaiting response... 404 Not Found
2018-10-17 11:50:39 ERROR 404: Not Found.

Makefile:21: recipe for target 'get-saved-data' failed
make[1]: *** [get-saved-data] Error 8
make[1]: Leaving directory '/home/gitlab-runner/builds/b8d876c1/0/vidjil/vidjil/germline'
Makefile:54: recipe for target 'germline' failed
make: *** [germline] Error 2
ERROR: Job failed: exit status 1