Add Simone Balducci as external collaborator (#10)

* Add myself as member

* Set order to 10

* Why isn't it working?

* Add external flag

---------

Co-authored-by: Gregorio Berselli <gregorio_2000@hotmail.it>

Author: sbaldu

_members/simone-balducci.md

@@ -0,0 +1,16 @@
+---
+name: Simone Balducci
+image: https://github.com/sbaldu.png
+role: phd
+order: 1
+category: external
+affiliation: University of Bologna, INFN-CNAF, CERN
+links:
+  home-page: https://www.unibo.it/sitoweb/simone.balducci7/en
+  github: sbaldu
+  email: simone.balducci7@unibo.it
+---
+
+<p style="font-family: 'Georgia', serif; font-size: 18px;">
+PhD student in Computer Science and software developer at CERN.
+</p>