Update README.md to include ISO code for Modern Standard Arabic (#2)

- Update README.md to include ISO code for Modern Standard Arabic (f49b8525760b3e389011f66e909e0bc94de2a3bb)


Co-authored-by: Matthew A Hernandez <[email protected]>

README.md

@@ -7,6 +7,7 @@ task_categories:
 - translation
 language:
 - en
+- arb
 tags:
 - e-commerce
 - products