Add rudimentary license description.

mikefromgrr · Apr 12, 2022 · 286435f · 286435f
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@@ -17,6 +17,9 @@ Though it shouldn't be too difficult to add support for any of these.
 # Hardware
 Designed for ESP32 WeMos Mini D1 ESP-WROOM-32.
 
+# License
+You cannot use this software or any derivative of it for commercial purposes (e.g. sell a hardware timer based off of this design/code). 
+
 ## ESP32
 * https://www.aliexpress.com/item/1005001621896126.html
 * Cost: About $3.81 USD in March 2021, plus shipping.