Load in users and create new users if needed.

plugin/src/main/java/com/alttd/essentia/user/EssentiaUserManager.java

@@ -47,7 +47,7 @@ public class EssentiaUserManager implements UserManager {
 
     @Override
     public User createNewUser(UUID uuid) {
-        return null;
+        return new EssentiaUser.Builder().uuid(uuid).build();
     }
 
 }