Docs status badge

README.rst

@@ -2,7 +2,7 @@
 Beginning Arduino with PlatformIO
 =================================
 
-|build-status|
+|docs-status| |build-status|
 
 
 Beginner's Arduino projects for the `PlatformIO`_ IDE.
@@ -19,6 +19,10 @@ For use with the official `DFRobot tutorials`_:
 .. _`PlatformIO`: https://platformio.org/
 .. _`DFRobot tutorials`: https://raw.githubusercontent.com/DFRobot/Beginner-Kit-for-Arduino/master/Beginner%20Kit%20for%20Arduino%20Tutorial.pdf
 
+
+.. |docs-status| image:: https://readthedocs.org/projects/arduino-pio/badge/?version=latest
+    :target: https://arduino-pio.readthedocs.io/en/latest/?badge=latest
+    :alt: Documentation Status
 .. |build-status| image:: https://github.com/sethfischer/arduino-beginner/actions/workflows/build.yml/badge.svg
     :target: https://github.com/sethfischer/arduino-beginner/actions/workflows/build.yml
     :alt: Build status