Add note for temp pause to repo (#1476)

* Add note for temp pause to repo

* Update README.md

Co-authored-by: Alexandra Carrillo <12214231+alexandratran@users.noreply.github.com>

---------

Co-authored-by: Alexandra Carrillo <12214231+alexandratran@users.noreply.github.com>

README.md

@@ -1,3 +1,9 @@
+> :warning: **Temporary pause on contributions to the MetaMask docs repository**
+> 
+> Starting August 3, 2024, contributions to this repository will be temporarily paused.
+> Pull requests submitted during this period will not be reviewed or merged until after the pause.
+> Thank you for your understanding.
+
 # MetaMask developer documentation
 
 This is the MetaMask developer documentation repository.