feat: add filepicker package

packages/filepicker/src/Interface/FileReader.ts

@@ -0,0 +1,11 @@
+import { OnChunkCallback, FileSelectionResponse } from '../types'
+
+export interface FileReaderInterface {
+  selectFiles(): Promise<File[]>
+
+  readFile(file: File, minimumChunkSize: number, onChunk: OnChunkCallback): Promise<FileSelectionResponse>
+
+  available(): boolean
+
+  maximumFileSize(): number | undefined
+}