Hello Kamyar Mirzazadeh Moghadam,
You can extract the toolchain for Qt using the following command from within the bitbake environment:
$ bitbake meta-toolchain-qt5
The resulting file is an executable that will install the toolchain in your system. You may set it on Eclipse, Qt Creator or other IDE if you wish to have a development environment. There are some threads concerning this but there is not an updated guide for it.
The following document may be of help but it has not been updated in a while:
https://community.nxp.com/docs/DOC-328543
I hope this helps!
Regards,