DOC Add model-diagnostics to related projects (scikit-learn#30998)

Author: lorentzenchr

doc/related_projects.rst

@@ -74,6 +74,14 @@ enhance the functionality of scikit-learn's estimators.
 - `dtreeviz <https://github.com/parrt/dtreeviz/>`_ A Python library for
   decision tree visualization and model interpretation.
 
+- `model-diagnostics <https://lorentzenchr.github.io/model-diagnostics/>` Tools for
+  diagnostics and assessment of (machine learning) models (in Python).
+
+- `sklearn-evaluation <https://github.com/ploomber/sklearn-evaluation>`_
+  Machine learning model evaluation made easy: plots, tables, HTML reports,
+  experiment tracking and Jupyter notebook analysis. Visual analysis, model
+  selection, evaluation and diagnostics.
+
 - `yellowbrick <https://github.com/DistrictDataLabs/yellowbrick>`_ A suite of
   custom matplotlib visualizers for scikit-learn estimators to support visual feature
   analysis, model selection, evaluation, and diagnostics.