add a speaking weather bot

[akkshayTandon]

• derived from my previous bot, i.e. robo-speaker bot (merged in PR added-robo-speaker-bot #134 )
• the weather speaking bot takes a city name as input and speaks the current temperature in that city
• this bot uses modules such as

  requests - to fetch the weather from an api

  pyttsx3 - for speaking engine

  json - to convert the returned response from api to a json object

  geopy - a python client for various geocoding services

[akkshayTandon]

please assign me this issue under gssoc'23