update README.md

Author: Yueleng

README.md

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 # react-select-reinvent
- re-invent the react-select 
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+The purpose of this repository is to learn from the open source project: [react-select](https://github.com/JedWatson/react-select/tree/react-select%405.7.3)
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+By copying everything from the release version `[email protected]`, I'm adding my own comment for my understandings on those pieces of code.
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+The final purpose of this project is to contribute to project `react-select` after totally understaing every single piece of code.