added my picture (#50)

* added gael

* squared version of the picture

* change weight to reflect arrival order at twiinit

---------

Co-authored-by: GaelTouquet <[email protected]>
Co-authored-by: Adrien DELSALLE <[email protected]>

Author: GaelTouquet

assets/images/team/gael.jpg

@@ -0,0 +1,6 @@
+---
+name: "Gaël Touquet"
+designation: "Scientific Software Engineer"
+image: "images/team/gael.jpg"
+weight: 6
+---