Add ambient typescript declaration for CSS Modules (#768)

* Add ambient typescript declaration for CSS Modules

* Create two-bikes-brush.md

* ...

Author: developit

.changeset/two-bikes-brush.md

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+---
+"microbundle": patch
+---
+
+Add ambient typescript declaration for CSS Modules

index.d.ts

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+declare module '*.module.css' {
+    const classes: { [key: string]: string };
+    export default classes;
+}