Add Cheerlights Example!

[brentru]

Adding example for Cheerlights (https://github.com/adafruit/Adafruit_CircuitPython_ESP32SPI/blob/master/examples/esp32spi_cheerlights.py).

Note: URL changed from https to http since CircuitPython does not have a native SSL/TLS implementation.

Tested on: Adafruit CircuitPython 5.0.0-beta.5 on 2020-02-05; Adafruit Feather M4 Express with samd51j19

Auto-reload is on. Simply save files over USB to run them or enter REPL to disable.
code.py output:
Fetching json from http://api.thingspeak.com/channels/1417/feeds.json?results=1
{'channel': {'id': 1417, 'latitude': '40.5', 'name': 'CheerLights', 'longitude': '-80.22', 'updated_at': '2018-07-20T01:05:15Z', 'description': 'CheerLights is an \u201cInternet of Things\u201d project created by Hans Scharler that allows people\u2019s lights all across the world to synchronize to one color set by Twitter. This is a way to connect physical things with social networking experiences.', 'last_entry_id': 678401, 'field2': 'CheerLights HEX Color', 'field1': 'Last CheerLights Command', 'created_at': '2011-12-01T03:30:04Z'}, 'feeds': [{'created_at': '2020-03-11T15:58:21Z', 'field2': '#FF0000', 'field1': 'red', 'entry_id': 678401}]}
[{'created_at': '2020-03-11T15:58:21Z', 'field2': '#FF0000', 'field1': 'red', 'entry_id': 678401}]
{'created_at': '2020-03-11T15:58:21Z', 'field2': '#FF0000', 'field1': 'red', 'entry_id': 678401}
#FF0000