Add readthedocs.yml

This is done mainly to prevent the large satellite-recordings
submodule from being cloned by readthedocs.io when building docs

readthedocs.yml

@@ -0,0 +1,17 @@
+# .readthedocs.yml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+  configuration: docs/source/conf.py
+
+# Optionally build your docs in additional formats such as PDF and ePub
+formats: all
+
+# Do not include submodules, as they are not needed to build docs
+submodules:
+  exclude: all