Let Bedrock players join with Geyser

Geyser translates between the Bedrock and Java protocols, so one world serves both. Floodgate goes with it so Bedrock players do not need a Java account.

1. 1Install Geyser-Spigot and Floodgate into the plugins folder.
2. 2Restart the server so both generate their configs.
3. 3Open plugins/Geyser-Spigot/config.yml and set auth-type to floodgate.
4. 4Restart again. The console prints the Bedrock port Geyser is listening on.
5. 5Give Bedrock players your address and that port.