aes_wb_tb: Add apache 2.0 license

verilog/dv/user_proj_aes_tests/aes_wb/aes_wb_tb.v

diff --git a/verilog/dv/user_proj_aes_tests/aes_wb/aes_wb_tb.v b/verilog/dv/user_proj_aes_tests/aes_wb/aes_wb_tb.v
index 77cfea1..92abd61 100644
--- a/verilog/dv/user_proj_aes_tests/aes_wb/aes_wb_tb.v
+++ b/verilog/dv/user_proj_aes_tests/aes_wb/aes_wb_tb.v
@@ -1,3 +1,17 @@
+// Copyright 2020 Antmicro
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 `default_nettype none