allow to send files to chat

src/app/utils/allowedDocExtension.ts

@@ -0,0 +1,12 @@
+import { err, ok } from "neverthrow"
+
+export function allowedDocExtension(type: string) {
+  if (type == 'application/pdf' || type == 'application/doc' || type == 'application/docx' ||
+    type == 'application/xls' || type == 'application/xlsx' || type == 'application/ppt' ||
+    type == 'application/pptx' || type == 'application/txt') {
+
+    return ok(true)
+  } else {
+    return err(false)
+  }
+}