Add Captive, France

[cprodhomme]

Description

I add "ionic" as a stack, i will made an another PR to add this

Checklist

• I confirm that I've tried my best to follow the contributing instructions from the readme.
  • I needed to make an exception. I've explained it in the description above.
• I've made sure that the company description is written in the third person (or left empty, since it's optional).
• I've added a logo that is square, has a format of .jpeg, .png or .svg and doesn't exceed 50KB.