Icon Request: Frontend Tools

[SiimonStark]

• Redux
• Router
• Enzyme
• Jest
• Express

[tupaschoal]

Redux was added by #234 and Jest by #647 and both already appear on https://devicon.dev/, so a few more checkboxes can be ticked

[amacado]

@SiimonStark I will close this issue because as @tupaschoal pointed out we already have some of the mentioned icons. More important: This request does not follow our contribution guidelines on how to request icons. Feel free to create new icon requests with the icons which are not yet added! :)