Add a tag "watchware"/"surveillanceware"

[jvoisin]

For shady-but-not-stalkerware things like https://play.google.com/store/apps/details?id=com.mspy.lite

• Create a hosts_full.txt and a hosts.txt file.
• Tags in suricata
• Document this in the readme

[jvoisin]

Tag added via 25fd089d47c92677c612f0bb070a20f1d937df04

[Te-k]

Done with a785832a730a45bf2b6f83154521e6864cace3d2