beetlex-core update .net core to v3.0 (#5006)
* docker add COMPlus_ReadyToRun variable
update beetlex
* update beetlex, enabled thread queue
* beetlex framework add db and queries cases
* add db code
* change result json data
* update query url
* beetlex framework add fortunes cases
* change Content-Type
* add beetlex core cases
* fix queries cases
* update config
* change try readline
* update benchmark config
* Update README.md
* Update README.md
* change versus property
* beetlex-core update .net core to v3.0
* change beetlex-core project file