Add explanation of console tools to Readme
Add explanation of console tools to Readme

In the developer console, various simulation controls are exposed via
the `MeebaFarm` global object. This object was previously undocumented,
and exposes some functionality not available through the UI like
recording snapshots and exploring the currently simulated bodies.

Signed-off-by: Zac Delventhal <593147d2808cd66b7e2ad59ca4b0c07d6c52cddd@gmail.com>

meeba-farm/meeba-farm,meeba-farm/meeba-farm