Update on sam instruction on github wiki

[VCLanNguyen]

The instructions on using sam is currently not on github wiki, although it is on the old redmine wiki. It'll be much appreciated if the instructions of sam is also on github wiki to make navigation between the two wikis easier. Thanks

Redmine wiki: https://sbnsoftware.github.io/sbndcode_wiki/_How_to_create_and_use_a_SAM_definition.html
Github wiki: https://sbnsoftware.github.io/sbndcode_wiki/_How_to_create_and_use_a_SAM_definition.html