feat: add file type for json (#718)

Author: roryabraham

src/fileTypes.ts

@@ -5,6 +5,7 @@ const mimeTypes = Object.freeze({
   doc: 'application/msword',
   docx: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
   images: 'image/*',
+  json: 'application/json',
   pdf: 'application/pdf',
   plainText: 'text/plain',
   ppt: 'application/vnd.ms-powerpoint',
@@ -22,6 +23,7 @@ const utis = Object.freeze({
   doc: 'com.microsoft.word.doc',
   docx: 'org.openxmlformats.wordprocessingml.document',
   images: 'public.image',
+  json: 'public.json',
   pdf: 'com.adobe.pdf',
   plainText: 'public.plain-text',
   ppt: 'com.microsoft.powerpoint.ppt',
@@ -40,6 +42,7 @@ const extensions = Object.freeze({
   doc: '.doc',
   docx: '.docx',
   images: '.jpeg .jpg .png',
+  json: '.json',
   pdf: '.pdf',
   plainText: '.txt',
   ppt: '.ppt',