update README.md

Author: 404Setup

README.md

@@ -1,2 +1,15 @@
 # UltraSpeedLimit
-Limit the speed at which players can switch between servers.
+Limit the speed at which players can switch between servers.
+
+## Required
+- Java 17+
+- Velocity 3.3.0+
+- [Plugin|Lib] [MavenLoaderAPI 1.0.1+](https://github.com/LevelTranic/MavenLoader)
+
+## Config
+```yaml
+connections: 2 #The number of times that can be switched between the server during the expiration time+1
+expired-connections: 30 #Expired time, unit: second
+connect-failed-message: The connection speed limit has been reached! Please come back
+  later!
+```