Add instructions for side loading, Python, etc.

[ian-mcdowell]

I've still not successfully built Python after trying for a few hours...It'd be nice to have some instructions on how to enable Python, Lua, etc, locally.

Additionally, what specific reasons/guidelines are we using for whether to include a command by default or not? In my opinion, Python and Lua should be included by default.

@holzschu is probably the expert in this area.

[holzschu]

oh. Precompiled binaries for all libraries are available here: https://github.com/holzschu/ios_system/releases/download/v1.0/release.tar.gz

My position on commands is "I provide, whoever is submitting to the AppStore decides". Remember that about a month ago, we weren't even sure that shell commands like "ls" would pass.