[LICENSE] used addlicense to add licenses to all source files
diff --git a/verilog/rtl/counter_timer_low.v b/verilog/rtl/counter_timer_low.v
index fd94d2c..7dd30bc 100755
--- a/verilog/rtl/counter_timer_low.v
+++ b/verilog/rtl/counter_timer_low.v
@@ -1,3 +1,17 @@
+// Copyright 2020 Efabless Corporation
+//
+// 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
/* Simple 32-bit counter-timer for Caravel. */
