Added Alexandrs class

src/main/java/ch/unibas/dmi/dbis/cs108/multiplayer/server/AllClientNames.java

@@ -0,0 +1,14 @@
+package ch.unibas.dmi.dbis.cs108.multiplayer.server;
+
+/* This class is built to contain the usernames of all players in a single string.
+* This allows a duplicate check (--> ClientHandler) when a new player chooses
+* a name: does the string with all the previous names contain the new player's
+* desired username? If yes, he is being assigned a random name. If no, he can keep
+* his desired name. */
+
+public class AllClientNames {
+    static StringBuilder names = new StringBuilder();
+    public static String allNames(String currentName) {
+        return names.append(currentName).toString();
+    }
+}