Rule proposal: Require read-only props

[HenriBeck]

When using flow require that you make all of the props read-only.

[ljharb]

Specifically, this rule should require that all props be typed as covariant (with a +)

[drx]

@ljharb is this being worked on? If not I could take a stab at it.

[ljharb]

Go for it!