Add coverage info from CI in readme

5 jobs for master in 5 minutes and 1 second (queued for 7 seconds)
Status Job ID Name Coverage
  Build Testinstall
passed #286910
dailyBuildMasterAll

00:01:26

 
  Doc Coverage
passed #286921
Doc

00:01:20

passed #286917
TestCoverage

00:01:18

94.0%
 
  Deploy
passed #286924
pages

00:02:14

passed pages:deploy

00:00:40