ansible-vault: add page (#3279)

pages/common/ansible-vault.md

@@ -0,0 +1,28 @@
+# ansible-vault
+
+> Encrypts & decrypts values, data structures and files within Ansible projects.
+> More information: <https://docs.ansible.com/ansible/latest/user_guide/vault.html#id17>.
+
+- Create a new encrypted vault file with a prompt for a password:
+
+`ansible-vault create {{vault_file}}`
+
+- Create a new encrypted vault file using a vault key file to encrypt it:
+
+`ansible-vault create --vault-password-file={{password_file}} {{vault_file}}`
+
+- Encrypt an existing file using an optional password file:
+
+`ansible-vault encrypt --vault-password-file={{password_file}} {{vault_file}}`
+
+- Encrypt a string using Ansible's encrypted string format, displaying interactive prompts:
+
+`ansible-vault encrypt_string`
+
+- View an encrypted file, using a password file to decrypt:
+
+`ansible-vault view --vault-password-file={{password_file}} {{vault_file}}`
+
+- Re-key already encrypted vault file with a new password file:
+
+`ansible-vault rekey --vault-password-file={{old_password_file}} --new-vault-password-file={{new_password_file}} {{vault_file}}`