customer creation now pointing to velocity

src/main/java/zw/qantra/tm/exceptions/AlreadyExistsException.java

@@ -0,0 +1,15 @@
+package zw.qantra.tm.exceptions;
+
+public class AlreadyExistsException extends RuntimeException {
+
+    private String message;
+
+    public AlreadyExistsException(String message) {
+        this.message = message;
+    }
+
+    @Override
+    public String getMessage() {
+        return message;
+    }
+}