Add swagger api documentation

api/doc/browser_guide/templates/inline_quoted.html.erb

api/doc/browser_guide/templates/section.html.erb

api/doc/swagger-ui/index.html

api/doc/swagger-ui/oauth2-redirect.html

api/server.py

api/src/models/discussion.py

api/src/models/discussion_skeleton.py

api/static/swagger/favicon-16x16.png

api/static/swagger/favicon-32x32.png

api/static/swagger/neo_api.yaml

api/static/swagger/swagger-ui-bundle.js

api/static/swagger/swagger-ui-bundle.js.map

api/static/swagger/swagger-ui-standalone-preset.js

api/static/swagger/swagger-ui-standalone-preset.js.map

api/static/swagger/swagger-ui.css

api/static/swagger/swagger-ui.css.map

api/static/swagger/swagger-ui.js

api/static/swagger/swagger-ui.js.map