Hello Sreedhar,
Yocto uses a modular approach and each software package can be added as “recipes”. There are already a big number of available recipes. You can see which recipes are available as part of the BSP by running:
$ bitbake - s
To look for a specific package name:
$ bitbake -s | grep <string_to_look_for>
These packages are added very easily as you would only need to add them to your image for example by using IMAGE_INSTALL_append on the conf/local.conf file inside the build directory. You can find more information on the Yocto Prohect Reference Manual (link below for the poky warrior release)
https://www.yoctoproject.org/docs/2.7/ref-manual/ref-manual.html
If you would like to add your own application, you would need to integrate it to the Yocto environment, for which the Yocto Project BSP Developer’s Guide is useful. Ideally you would add a new layer with your own recipes which describe to Yocto how to fetch the source, compile it and install it on your image.
https://www.yoctoproject.org/docs/2.7/bsp-guide/bsp-guide.html
This is not trivial, but the Yocto Documentation is a good start.
I hope this helps!
Regards,
