front end -- javascript / ajax for adding user
integration between front and back end for add user
Merge branch 'feature/Sections_add3_CS' of https://github.com/Harvard-University-iCommons/icommons_lti_tools into feature/Sections_add3_CS

# By Mysore, Sapna
# Via Mysore, Sapna
* 'feature/Sections_add3_CS' of https://github.com/Harvard-University-iCommons/icommons_lti_tools:
  SDK method for add people to section with POST