Add estimated time to fully vaccinate people

Is your feature request related to a problem? Please describe. There are claims to fully vaccinate the people by the end of 2021. Claims are useless if not backed by data. It would be good to have an estimate time to fully vaccinate people as per the current average speed.

Describe the solution you'd like The solution is to show some text which for example says It will take 14 months to fully vaccinate people as per the current speed of 1.5 lakh doses per day.. The average speed can be calculated like this.

avg_doses_per_day = doses_administered_this_month / no_of_days_in_this_month

days_to_vaccinate_people = population_of_india / avg_doses_per_day

Describe alternatives you've considered None

Additional context I am willing to open a PR for this.