docs: migration script from vuex

[kj455]

I wrote a script which helps migrate to typed-vuex from vuex.

When I started using typed-vuex in an existing vue/nuxt project, I had to do some tedious work.

• add import statement
• replace getters with getterTree
• replace mutation with mutationTree
• replace action with actionTree

this script automate these dangling tasks using jscodeshift.

If this is acceptable, how should I contribute?
Would it better to describe it in the documentation?

[danielroe]

Would love this! I'd be happy to expose a binary to do this - or simply document a possible option. PR very welcome 😊

(Happy to work with you on the PR if you push what you have.)