public_keys: Added README

public_keys/README.md

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+# `/public_keys` for Ansible project
+
+This directory is here to store all facts and public keys generated by Ansible on remotes.
+In difference to the `/facts` directory,
+this directory is here to store each fact in a single file
+so Ansible itself and other scripts can use them more easily.
+Also, if this directory needs to be restored,
+the full current Ansible playbook needs to be run