add optional requirements

Neradoc · Neradoc · commit 1888b94d3ba3 · 2022-07-13T18:43:47.000+02:00
diff --git a/optional_requirements.txt b/optional_requirements.txt
@@ -0,0 +1,5 @@
+# SPDX-FileCopyrightText: 2022 Adafruit Industries
+#
+# SPDX-License-Identifier: Unlicense
+
+adafruit-circuitpython-esp32spi
