Add kdecole-api, stan-api, grdf-api and sfrmobile-api

[maelgangloff]

Hello,
Here are some API client repo's along with documentation resulting from my findings:

• kdecole-api: API client of EMS based on Skolengo software (Kosmos Education). It allows you to retrieve notes, homework, internal messaging, etc.
• stan-api: API client of the STAN urban transport network (Nancy, France). It allows to know for each stop the waiting time before the next bus.
• grdf-api: API client of GRDF (gas distribution network in France). It is used to retrieve gas consumption data.
• sfrmobile-api: API client of SFR (telephone company in France). It allows you to retrieve your consumption, your bills, and other information about the telephone subscription.

Some projects contain Swagger files to document how APIs work