Add Smallstep Certifications, a personal CA toolkit for SSO TLS & SSH.

README.md

@@ -355,6 +355,7 @@
 * [Samba](https://www.samba.org/) – Active Directory and CIFS protocol implementation.
 * [BounCA](https://bounca.org/) - A personal SSL Key / Certificate Authority web-based tool for creating self-signed certificates.
 * [easy-rsa](https://github.com/OpenVPN/easy-rsa) - bash script to build and manage a PKI CA.
+* [Smallstep Certificates](https://smallstep.com/certificates/) - A private certificate authority (X.509 & SSH) and related tools for secure automated certificate management.
 
 ## IT Asset Management