add WIP file upload component

src/components/FileUpload.tsx

@@ -0,0 +1,18 @@
+import React from "react"
+
+export default function FileUpload() {
+  //fetch("/upload/")
+  const fileHandler = (event: React.FormEvent<HTMLInputElement>) => {
+    const files = (event.target as HTMLInputElement).files
+    if (files) {
+      console.log(files[0])
+      const reader = new FileReader()
+      reader.addEventListener("load", (event) => {
+        console.log(event.target)
+      })
+      reader.readAsText(files[0])
+    }
+  }
+
+  return <input type="file" onInput={fileHandler} />
+}