added upload button

src/components/FileUploadButton.tsx

@@ -0,0 +1,26 @@
+import React from "react"
+import { useRef } from "react"
+
+interface Props {
+    onUpload?: (files: FileList)=>void
+}
+
+const FileUploadButton: React.FC<Props> = (props) => {
+
+	const inputRef = useRef<HTMLInputElement>(null)
+    
+	return ( 
+		<>
+			<button onClick={()=>inputRef.current?.click()} >
+                Upload files
+			</button>
+			<input type="file" multiple style={{display:"none"}} ref={inputRef} onInput={()=>{
+				if (inputRef.current && inputRef.current.files){
+					props.onUpload?.(inputRef.current.files)
+				}
+			}}/>
+		</>
+	)
+}
+
+export default FileUploadButton