Copyedit README.md, add helpful links
Edits to README.md only. Not changing the meaning, just polishing the language a bit and adding some links.
Edited by nealmcb
UNCLASSIFIED - NO CUI
ATTENTION: Immediate action is required to maintain compatibility with P1 services. Please visit https://p1notifications.dso.mil and see the "DSO.MIL Certificates Renewal" announcement under the "Notifications" section for more details.
Edits to README.md only. Not changing the meaning, just polishing the language a bit and adding some links.
UNCLASSIFIED - NO CUI