Add minimal configuration for configuring FreeSWITCH from scratch

Add minimal configuration for configuring FreeSWITCH from scratch

The default "vanilla" configuration that comes with FreeSWITCH has
been designed as a showcase of the configurability of the myriad of
features that FreeSWITCH comes with out of the box. While it is very
helpful in tinkering with FreeSWITCH, it has a lot of extraneous stuff
enabled/configured for use in a production system. This configuration
aims to take the reverse stance -- it attempts to be a starting point
for configuring a new system by "adding" required features (instead of
removing them as one would do if one starts with the default
configuration).

Jira: FS-7362
Source: https://github.com/mx4492/freeswitch-minimal-conf/commit/270941d6f2dca279f1bb8762d072940273d5ae11