Add .vault_pass on ignore list

.gitignore

@@ -4,3 +4,6 @@
 
 # Module directory
 .terraform/
+
+# Vault password file
+.vault_pass

README.md

 # bootstrap-git
-Bootstrap git repository with some cool stuffs
+Bootstrap git repository with some cool stuffs.
+ - .gitignore for terraform and ansible-vault
+
+## Keep your secret safe
+First [install Ansible](http://docs.ansible.com/ansible/latest/intro_installation.html) on your laptop.
+
+After create ```.vault_pass``` file under the repository root folder and put in it a strong password.