Add requirements.txt for Sphinx with sphinx and numpy

diff --git a/docs/requirements.txt b/docs/requirements.txt
new file mode 100644 (file)
index 0000000..448e042
--- /dev/null
+++ b/docs/requirements.txt
@@ -0,0 +1,6 @@
+# SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
+#
+# SPDX-License-Identifier: Unlicense
+
+sphinx>=4.0.0
+numpy