adding neptune link

Author: Blaizzy

doc/related_projects.rst

@@ -66,6 +66,11 @@ enhance the functionality of scikit-learn's estimators.
 
 **Experimentation frameworks**
 
+- `Neptune <https://neptune.ai/>`_ is a metadata store for MLOps, 
+  built for teams that run a lot of experiments.‌ It gives you a single 
+  place to log, store, display, organize, compare, and query all your 
+  model building metadata.
+
 - `Sacred <https://github.com/IDSIA/Sacred>`_ Tool to help you configure,
   organize, log and reproduce experiments