Implement blackbox in Golang (#250)

* Initial release

docs/with-ansible.md

@@ -0,0 +1,18 @@
+How to use the secrets with Ansible?
+===================================
+
+Ansible Vault provides functionality for encrypting both entire files
+and strings stored within files; however, keeping track of the
+password(s) required for decryption is not handled by this module.
+
+Instead one must specify a password file when running the playbook.
+
+Ansible example for password file: `my_secret_password.txt.gpg`
+
+```
+ansible-playbook --vault-password-file my_secret_password.txt site.yml
+```
+
+Alternatively, one can specify this in the
+`ANSIBLE_VAULT_PASSWORD_FILE` environment variable.
+