Exercise 1
- Start MongoDB server
 - Connect to MongoDB server using MongoDB shell
 - Create a comics database
 - Create the superheroes collection
 - Insert the following documents one by one
 
{ "name": "SPIDER-MAN", "image": "spiderman.jpg" }
{ "name": "CAPTAIN MARVEL", "image": "captainmarvel.jpg" }
{ "name": "HULK", "image": "hulk.jpg" }
- Show the available databases
 - Show the aviablables collections for the comics database
 - Disconect from MongoDB shell
 - Connect to MongoDB shell again using the comic database as initial selected one