docs: Add list of third-party modules

Migrated from our wiki at https://wiki.mumble.info/wiki/Mumo

docs/third-party-modules.md

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+# Third-Party Mumo Modules
+
+Note that third-party means they are not created, supported, or explicitly verified or advocated by us. Do your own due diligence and assessments.
+
+## Chat Img
+
+[chatimg on GitHub](https://github.com/aselus-hub/chatimg-mumo)
+
+A more full featured implementation of the same functionality as Url to Image. Allows injection of photos into chat, re-sizing them if they are larger then the size accepted by the mumble protocol and allowing the server admin to set a max width/height for the image so that it is scaled through html or thumbnailing to never be larger then prescribed. Allows the conversion of images within regular chat messages w/o bang commands as an option. Finally the injection of any number of images present after the bang or within a message.
+
+## Videoinfo
+
+[mumo-videoinfo on GitHub](https://github.com/while-loop/mumo-videoinfo)
+
+Mumo plugin to provide YouTube video information to Mumble.
+
+## Max users
+
+[mumo-maxusers on GitHub](https://github.com/ExplodingFist/mumo-maxusers/)
+
+This is a MuMo module to provide an administrator the capability of enforcing granular user limits by channel in mumble.
+
+## Opcommand
+
+[mumo-opcommand on GitHub](https://github.com/ExplodingFist/mumo-opcommand)
+
+Temporarily add user or remove user to/from a group via GUI command line.
+
+## mumo-password
+
+[mumo-password on GitHub](https://github.com/Betriebsrat/mumo-password)
+
+Generates a random password for mumble which expires in 30 minutes.
+
+## mumo-chatlogger
+
+[mumo-chatlogger on GitHub](https://github.com/braandl/chatlogger-for-mumo)
+
+Logs server chats and makes them accessible to the users as a history