PR to add room meeting details endpoint

[sQu4rks]

This PR adds a room meeting details endpoint to the webexteamssdk. You can request the meeting details for a room like follows:

from webexteamssdk import WebexTeamsAPI

api = WebexTeamsAPI()

ROOM_ID = "<Add room id here>"

room = api.rooms.get(ROOM_ID)
print(str(room))

meeting_details = api.room_meeting_details.get(ROOM_ID)
print(str(meeting_details))

This resolves #111

[cmlccie]

@sQu4rks, I would like to keep the Rooms API endpoints in the same module and class. Please see a proposed alternate implementation in PR #130

[sQu4rks]

Closing as the alternative implementation from @cmlccie has been merged.