Add coverage info from CI in readme

5 jobs for master in 18 minutes and 43 seconds (queued for 22 seconds)
Status Job ID Name Coverage
  Build Testinstall
passed #286700
dailyBuildMasterAll

00:03:56

 
  Doc Coverage
passed #286702
Doc

00:05:30

passed #286701
TestCoverage

00:12:25

91.0%
 
  Deploy
passed #286703
pages

00:01:06

passed pages:deploy

00:01:15