Add action-creator-mirror

[bliu2000]

I suggest to add action-creator-mirror to the list.

It's a more effective way to organise Redux action creator codes.

It's inspired by Flux Standard Action and Key Mirror. It’s designed for people:

• Who don’t want to write constant strings. (never write const ADD_TODO = 'ADD_TODO')
• Who want single source of truth and don’t want to look over actions back and forth.
• Who want to group relative variables and concepts into one array.
• Who still want to keep the redux real.
• And (most importantly) who want to use the Auto-Completing feature in IDEs.