What country has made a vaccine for covid - 19?

 Have you heard of the deadly virus that has been going around for roughly 9 months?

Covid - 19 has killed 1 person on the west coast in New Zealand, and 1,654 have confirmed cases in New Zealand. 1,531 people have recovered from the virus.

But luckily China has found a vaccine for Covid and are healing a bunch of people. If the vaccine gets around the world it will heal everyone with Covid.

My questions I have for this is:

1. What is in the vaccine? 

2. How did they get this idea?

3. How does this vaccine work and what does it contain?

My opinion if this gets around the world is " If the vaccine does get to everyone with covid will it cure them depending on how bad it is? ".

My opinion on how this information got around: " I think he or she took their time to go around and gather up all the information and made the right choice to let it out to the world ".