Merge pull request #1301 from ElectronicCats/third-party

Add new list for "third-party" or "non-Adafruit" boards to README

Author: dhalbert

README.rst

@@ -61,6 +61,12 @@ Other
    library <https://github.com/adafruit/Adafruit_CircuitPython_SD>`__)
 -  `Arduino Zero <https://www.arduino.cc/en/Main/ArduinoBoardZero>`__
 
+"Third-party" or "non-Adafruit" boards
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+-  `Electronic Cats Meow Meow <https://electroniccats.com/gomeow/>`__
+
+
 Download
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