Packaging is the step prior to sharing or releasing a tweak/application/tool/library/theme. Here you put all your project files into a single nicely wrapped file that others can install on their devices.
Tools
To do: add existing tools, on which platforms they are available, how to use them.
Control file
To do: add layout of fields, what do they mean, how they are used. Refer to saurik's post and links at the bottom.