Paho-C for OpenVMS I64

This document serves as an installation and configuration guide for the Paho-C MQTT client API on OpenVMS I64. It covers system requirements, installation procedures using the PCSI utility, post-installation tasks such as configuring startup files and setting up logical names, and instructions for building and running example applications. The kit is based on the Paho-C 1.0.3 distribution and includes SSL/TLS support, utilizing OpenSSL.