Hello Mutyalarao Neelapala,
You may add the wpa-supplicant package by adding the following line to your local.conf file:
IMAGE_INSTALL_append = “ wpa-supplicant”
Or you may just bake the recipe for it using bitbake. In case you would like to cross compile the source code manually you would need to extract the toolchain, following the instructions on the following document:
Task #7 - Create the toolchain
I hope this helps!