Update gallery.yml (#1059)

Author: sgcorcoran

docs/gallery.yml

@@ -1,3 +1,7 @@
+- name: Python for Materials Engineers
+  website: https://sgcorcoran.github.io/Python-for-MSE/intro.html
+  repository: https://github.com/sgcorcoran/Python-for-MSE
+  image: https://sgcorcoran.github.io/Python-for-MSE/_images/71f487b5c22dda4ec3f5d8a4897a858b20e7520b5d1b918d72c2ededbddebff9.png
 - name: InterpretML
   website: https://interpret.ml/docs
   repository: https://github.com/interpretml/interpret