add contributor to 1d bloodflow readme (#775)

* add contributor

* Update README.md

examples/healthcare/bloodflow_1d_mgn/README.md

@@ -5,6 +5,11 @@ MeshGraphNet presented in the paper [Learning Reduced-Order Models for Cardiovas
 Simulations with Graph Neural Networks](https://arxiv.org/abs/2303.07310)
 (Pegolotti et al, 2023).
 
+## Contributor
+
+The main contributor for this work is Luca Pegolotti who was part of the
+Cardiovascular Biomechanics Computation Lab at Stanford University.
+
 ## Problem overview
 
 Three-dimensional simulations of the Navier-Stokes equations are the gold standard