Add base files

src/main/java/com/university/chat/Server/ChatServer.java

@@ -0,0 +1,15 @@
+package com.university.chat.Server;
+
+public class ChatServer {
+    // TODO: declare a single shared UserManager instance (static final)
+    //         This MUST be shared by all ClientSession threads so that
+    //         broadcasting and private messaging work correctly.
+
+    public static void main(String[] args) {
+        // TODO: Create a ServerSocket
+
+        // TODO: In an infinite loop:
+        //  accept an incoming client connection
+        //  make a new thread running ClientSession for each user.
+    }
+}