docs: add atlas_sdk to attention

Author: erfanium

README.md

@@ -20,6 +20,8 @@ details. In short:
 - if you want most of MongoDB feature working with Deno and you don't care about
   the possible overheads by using node compat layer, you may try the
   `npm:mongodb` driver
+- if you are using MongoDB Atlas, using
+  [atlas_sdk](https://github.com/erfanium/atlas_sdk) can be your best option.
 
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