Add MilkmApp to Safe Store

[yvesfracari]

As part of a grant with CoW Protocol, bleu developed a Safe App to create Milkman Orders. The app was sent to Safe Review following this guide, and I received the information that it is ready to be listed in the Store. I was also informed that the next step is to open this PR.

The app link is: https://cow-tools-bleu-fi.vercel.app

Let me know if you guys need more information or if I need to do something else.

[dasanra]

Hey, this is not the repo for the apps submission.

Please follow this guide for the process