Add a counter and a link to issues that are ready to start (#4217)
Add a counter and a link to issues that are ready to start (#4217)

This adds what the subject says to the readme

Former-commit-id: abfd006871ea50edd02a548efc1932324f85692d
Former-commit-id: 74ddf1bc139997ba7cc90220367e486e9e230882
biplobice/concrete5,concrete5/concrete5,deek87/concrete5,triplei/concrete5-8,KorvinSzanto/concrete5,KorvinSzanto/concrete5,deek87/concrete5,olsgreen/concrete5,jaromirdalecky/concrete5,mainio/concrete5,biplobice/concrete5,mlocati/concrete5,a3020/concrete5,MrKarlDilkington/concrete5,MrKarlDilkington/concrete5,acliss19xx/concrete5,haeflimi/concrete5,olsgreen/concrete5,KorvinSzanto/concrete5,concrete5/concrete5,mainio/concrete5,jaromirdalecky/concrete5,jaromirdalecky/concrete5,deek87/concrete5,MrKarlDilkington/concrete5,hissy/concrete5,triplei/concrete5-8,jaromirdalecky/concrete5,olsgreen/concrete5,acliss19xx/concrete5,acliss19xx/concrete5,deek87/concrete5,rikzuiderlicht/concrete5,hissy/concrete5,haeflimi/concrete5,triplei/concrete5-8,a3020/concrete5,haeflimi/concrete5,mlocati/concrete5,concrete5/concrete5,rikzuiderlicht/concrete5,mlocati/concrete5,rikzuiderlicht/concrete5,concrete5/concrete5,hissy/concrete5,biplobice/concrete5,mlocati/concrete5,biplobice/concrete5,mainio/concrete5,haeflimi/concrete5,hissy/concrete5