Merge pull request #3776 from paddymul/subproject-explanation

Explain that ipywidgets is part of jupyter-widgets software subproject

Author: ibdafna

README.md

@@ -18,6 +18,8 @@ Learning becomes an immersive, fun experience. Researchers can easily see
 how changing inputs to a model impact the results. We hope you will add
 ipywidgets to your notebooks, and we're here to help you get started.
 
+The ipywidgets package is under the [Jupyter-Widgets](https://github.com/jupyter-widgets) [software subproject](https://jupyter.org/governance/software_subprojects.html).
+
 ## Core Interactive Widgets
 
 The fundamental widgets provided by this library are called core interactive

docs/source/contributing.md

@@ -1,5 +1,7 @@
 # Contributing
 
+The ipywidgets package is under the [Jupyter-Widgets](https://github.com/jupyter-widgets) [software subproject](https://jupyter.org/governance/software_subprojects.html).
+
 We appreciate contributions from the community.
 
 We follow the [IPython Contributing Guide](https://github.com/ipython/ipython/blob/main/CONTRIBUTING.md)