public_keys: Allow scripts in gitignore for usage in Ansible

.gitignore

@@ -2,6 +2,8 @@ credentials/**
 facts/**
 public_keys/**
 !README.md
+!public_keys/*.sh
+!public_keys/*.py
 *.retry
 *.facts
 /*.yml

public_keys/README.md

@@ -6,3 +6,8 @@ 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
+
+## Scripts
+
+This directory contains scripts tracked by the repository to allow easier lookups in the given data by Ansible or other scripts.
+Each script itself will contain a short description of its usage.