add some more to the CI Readme

add two paragraphs further explaining the tag CI and noteworthy specialties
7 jobs for master in 214 minutes and 31 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Make
passed #5415
docker2
run_make

00:19:10

 
  Test
passed #5416
docker2
run_test

00:47:47

 
  Doc
passed #5417
docker2
make_manual

03:10:24

 
  Package Release
passed #5418
docker2
bundle_tar

00:02:22

 
  Upload Release
passed #5419
docker2
upload_nightly

00:02:33

 
  Curry Lang
passed #5420
docker2
link_nightly

00:01:18

 
  Curry Lang Ci
passed downstream