docs: added Mark Erikson quote

website/docs/introduction.md

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 # Immer
 
+Immer (German for: always) is a tiny package that allows you to work with immutable state in a more convenient way.
+
+> Immer is life-changing as a JS dev, and I'm not even exaggerating :) Like, it's right up there with Prettier in terms of "wow this package is amazing, how did I ever live without it?" --Mark Erikson, (the) Redux Maintainer, @replayio
+
 Winner of the "Breakthrough of the year" [React open source award](https://osawards.com/react/) and "Most impactful contribution" [JavaScript open source award](https://osawards.com/javascript/) in 2019.
 
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+
 - Introduction blogpost: [Immer: Immutability the easy way](https://medium.com/@mweststrate/introducing-immer-immutability-the-easy-way-9d73d8f71cb3)
 - Short Egghead.io lesson covering the Immer essentials: [Simplify creating immutable data trees with Immer (7m)](https://egghead.io/lessons/redux-simplify-creating-immutable-data-trees-with-immer)
 - Free in-depth Egghead.io course: [Immutable JavaScript Data Structures with Immer (58m)](https://egghead.io/courses/immutable-javascript-data-structures-with-immer)
 
 ---
 
-Immer (German for: always) is a tiny package that allows you to work with immutable state in a more convenient way.
-
 ### Immer simplifies handling immutable data structures
 
 Immer can be used in any context in which immutable data structures need to be used. For example in combination with React state, React or Redux reducers, or configuration management. Immutable data structures allow for (efficient) change detection: if the reference to an object didn't change, the object itself did not change. In addition, it makes cloning relatively cheap: Unchanged parts of a data tree don't need to be copied and are shared in memory with older versions of the same state.