add link to an example extension on how to write intotext to images
Updated Developing extensions (markdown)
scripts.basedir() example
metadata.ini written by @wfjsw Co-Authored-By: Jabasukuriputo Wang <2220320+wfjsw@users.noreply.github.com>
Add send text example #11709
Add some user template extensions
add internals diagram by hananbeer, and extensions info
Edit localization extension directory name, according to the code it was "localizations" with a "s"
Created Developing extensions (markdown)