create issues for use-case-related topics in the design repsository

[mobb]

in AHM notes, p7: https://docs.google.com/document/d/1uVQWpAaRfkdi8tWA0ePMQC_Fvgjg9xEoCKKrP7Rw24A/edit

section titled Below is a matrix of the mini-use cases MMS would like to see, for both tagging and search