vault: add page

pages/common/vault.md

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+# vault
+
+> HashiCorp Vault, a tool for managing secrets.
+
+- Create a new vault, requiring at least 2 out of 5 keyshares to unseal:
+
+`vault init -key-shares={{5}} -key-threshold={{2}}`
+
+- Unseal a vault, by providing one of the keyshares. Repeat with necessary key-shares until unsealed:
+
+`vault unseal {{key-share-x}}`
+
+- Authenticate client against vault, using an authentication token:
+
+`vault auth {{authentication-token}}`
+
+- Store a new secret in the vault:
+
+`vault write {{secret/hello}} value={{world}}`
+
+- Read a secret from the vault:
+
+`vault read {{secret/hello}}`
+
+- Seal the vault:
+
+`vault seal`