Update README.md

Jason Mobarak · web-flow · commit e6466c77c974 · 2021-04-12T14:21:35.000-07:00
diff --git a/README.md b/README.md
@@ -1,6 +1,8 @@
-libswiftnav
+libswiftnav - ARCHIVED
 ===========
 
+Please see https://github.com/swift-nav/libswiftnav
+
 [![Build status][1]][2] [![Coverage status][3]][4]
 
 Libswiftnav is a platform independent library that implements GNSS functions
