update index ts file

Author: realdevvora

types/index.d.ts

@@ -3,3 +3,8 @@ declare module '@pmndrs/assets/hdri/city.exr' {
   const url: string
   export default url
 }
+
+declare module '*.module.css' {
+  const classes: { [key: string]: string }
+  export default classes
+}