Add numpy requirement to docs/requirements.txt

diff --git a/docs/requirements.txt b/docs/requirements.txt
new file mode 100644 (file)
index 0000000..cf58cbf
--- /dev/null
+++ b/docs/requirements.txt
@@ -0,0 +1,5 @@
+# SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
+#
+# SPDX-License-Identifier: Unlicense
+
+numpy>=1.21.5