Add Typescript section to Redux Toolkit Example (#23166)
Add Typescript section to Redux Toolkit Example (#23166)

I have added a new section to the `with-redux-toolkit` example on setting up Typescript with Redux Toolkit and React-Redux.

It links the redux toolkit documentation and Next.js documentation on adding Typescript to a Next.js project.
zeit/next.js,flybayer/next.js,JeromeFitz/next.js,flybayer/next.js,zeit/next.js,azukaru/next.js,azukaru/next.js,flybayer/next.js,JeromeFitz/next.js,JeromeFitz/next.js,azukaru/next.js,flybayer/next.js,azukaru/next.js,zeit/next.js,JeromeFitz/next.js