hdl_example: Adding License header to action_axi_slave.vhd
+----------------------------------------------------------------------------
+----------------------------------------------------------------------------
+--
+-- Copyright 2016,2017 International Business Machines
+--
+-- 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.
+--
+----------------------------------------------------------------------------
+----------------------------------------------------------------------------
+
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
