Use package com.velocitypowered.proxy

src/main/java/com/velocitypowered/proxy/Velocity.java

@@ -0,0 +1,15 @@
+package com.velocitypowered.proxy;
+
+import com.velocitypowered.proxy.connection.VelocityServer;
+
+public class Velocity {
+    public static void main(String... args) throws InterruptedException {
+        VelocityServer server = new VelocityServer();
+        server.initialize();
+
+        while (true) {
+            // temporary until jline is added.
+            Thread.sleep(999999);
+        }
+    }
+}