Transform class static block (#12143)

Co-authored-by: Nicolò Ribaudo <nicolo.ribaudo@gmail.com>
Co-authored-by: Brian Ng <bng412@gmail.com>

packages/babel-plugin-proposal-class-static-block/README.md

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+# @babel/plugin-proposal-class-static-block
+
+> Allow transforming of class static blocks
+
+See our website [@babel/plugin-proposal-class-static-block](https://babeljs.io/docs/en/next/babel-plugin-proposal-class-static-block.html) for more information.
+
+## Install
+
+Using npm:
+
+```sh
+npm install --save-dev @babel/plugin-proposal-class-static-block
+```
+
+or using yarn:
+
+```sh
+yarn add @babel/plugin-proposal-class-static-block --dev
+```