Add: Exception thrown while parsing tokens

src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/parser/ProtocolParserException.java

@@ -0,0 +1,7 @@
+package ch.unibas.dmi.dbis.cs108.casono.server.network.parser;
+
+public class ProtocolParserException extends RuntimeException {
+    public ProtocolParserException(String message) {
+        super(message);
+    }
+}