step: add page (#14390)

pages/common/step.md

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+# step
+
+> An easy-to-use CLI tool for building, operating, and automating Public Key Infrastructure (PKI) systems and workflows.
+> See also: `openssl`.
+> More information: <https://smallstep.com/docs/step-cli/>.
+
+- Inspect the contents of a certificate:
+
+`step certificate inspect {{path/to/certificate.crt}}`
+
+- Create a root CA certificate and a key (append `--no-password --insecure` to skip private key password protection):
+
+`step certificate create "{{Example Root CA}}" {{path/to/root-ca.crt}} {{path/to/root-ca.key}} --profile root-ca`
+
+- Generate a certificate for a specific hostname and sign it with the root CA (generating a CSR can be skipped for simplification):
+
+`step certificate create {{hostname.example.com}} {{path/to/hostname.crt}} {{path/to/hostname.key}} --profile leaf --ca {{path/to/root-ca.crt}} --ca-key {{path/to/root-ca.key}}`
+
+- Verify a certificate chain:
+
+`step certificate verify {{path/to/hostname.crt}} --roots {{path/to/root-ca.crt}} --verbose`
+
+- Convert a PEM format certificate to DER and write it to disk:
+
+`step certificate format {{path/to/certificate.pem}} --out {{path/to/certificate.der}}`
+
+- Install or uninstall a root certificate in the system's default trust store:
+
+`step certificate {{install|uninstall}} {{path/to/root-ca.crt}}`
+
+- Create a RSA/EC private and public keypair (append `--no-password --insecure` to skip private key password protection):
+
+`step crypto keypair {{path/to/public_key}} {{path/to/private_key}} --kty {{RSA|EC}}`
+
+- Show help for subcommands:
+
+`step {{path|base64|certificate|completion|context|crl|crypto|oauth|ca|beta|ssh}} --help`