Update README.md

somebody pushed all the model exports into exportedModels, but... we never create the directory.

we should do that also do this in the user instructions, just because storing into a directory that doesn't exist is not good :)

Author: mikekgfb

README.md

@@ -90,10 +90,11 @@ cd torchchat
 python3 -m venv .venv
 source .venv/bin/activate
 ./install/install_requirements.sh
+mkdir exportedModels
 ```
 [skip default]: end
 
-[shell default]: ./install/install_requirements.sh
+[shell default]: mkdir exportedModels; ./install/install_requirements.sh
 
 ## Commands