1 of 1 people found this helpful
well, actually there is documentation available: https://www.yoctoproject.org/documentation/presentations. The development manual Yocto Project Development Manual referred there also includes descriptions on image customizations.
On your specific request: to just add packages you'd need to
- find / write the recipes (e.g. oe-core/meta/recipes-devtools/python/python-numpy at master · openembedded/oe-core · GitHub for numpy)
- add the corresponding packages to edison-image.bb, or edison-image.bbappend respectively. (IMAGE_INSTALL += "<package name>")