chore: Add missing readmes for enterprise/cmd services

Created by: efritz

Created by: sourcegraph-bot

Notifying subscribers in CODENOTIFY files for diff f15c904291c085a50438e5ec845cf98f7687c447...38ce432bb11b63acd515fb005979d0a239cf699b.

Notify	File(s)
@beyang	enterprise/cmd/precise-code-intel-worker/README.md

Created by: efritz

Can fill out additional data later.

Created by: nicksnyder

Great, thank you!