Document supported scripts

[cdavernas]

What would you like to be added:

Document the scripts that runtime must support.

I suggest we support at least the following, because they are the most commonly used:

• Javascript
• Python

Or maybe something like:

• {interpreter}:{version}

Where interpreter could be node-js or cpython or whatever.

Why is this needed:

Defines and documents minimum script evaluation feature support.

[cdavernas]

Closed as duplicate of #874