#63 - Added license notice re. header files from ESP-IDF.

mock-idf/README.md

@@ -3,4 +3,23 @@
 Mock-idf is a minimal mock of Espressif's ESP-IDF framework that allows Smooth-based applications to build on Linux
 without while still referencing IDF headers and functions etc. Only the bare minimum is mocked.
 
-Note: This is a **mock**, not a simulator, so don't expect things like I2C to actually give you back any data.   
+Note: This is a **mock**, not a simulator, so don't expect things like I2C to actually give you back any data.
+
+# License notice regarding header files borrowed from ESP-IDF
+
+Some header files in mock-idf have their origin in whole or in part in [ESP-IDF](https://github.com/espressif/esp-idf).
+As such those parts have the following license applied to them:
+
+    Copyright 2017-2018 Espressif Systems (Shanghai) PTE LTD
+
+    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.