Add coverage info from CI in readme

5 jobs for master in 5 minutes and 11 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build Testinstall
passed #286848
dailyBuildMasterAll

00:01:51

 
  Doc Coverage
passed #286850
Doc

00:02:57

passed #286849
TestCoverage

00:02:33

86.0%
 
  Deploy
passed #286851
pages

00:00:22

passed pages:deploy

00:01:41