Updated documentation for managing D150 transcoding cards

Updated documentation for managing D150 transcoding cards
A simple trick to find all the system paths used in FreeSWITCH
Linking FreeSWITCH and CGrates for realtime credit control and billing
Using Python3 inside the FreeSWITCH Dialplan
A quick look at a possible cause for “INCOMPATIBLE DESTINATION” errors in FreeSWITCH.
Bad Extension is nothing to do with the Dialplan…
Using FreeSWITCH as an IMS Application Server
Starting calls from FreeSWITCH
Using mod_httpapi to HTTP POST call recordings to a remote server
Adding support for AMR Codec in FreeSWITCH