chore: add Timestamp Microservice project to frontend cert

[jdwilkin4]

The frontend cert will have a brief section to talk about and practice working with node and express.

Instead of a traditional lab here, we will use the existing Timestamp Microservice .

https://www.freecodecamp.org/learn/back-end-development-and-apis/back-end-development-and-apis-projects/timestamp-microservice