Get time slot json and parse it
Add check stock method
Add order method
Get first and last name from json, and trigger the final step
trigger the order method if timeslot and stock is not null.
Parse the result json object to verify the results
print the result message to screen
Add google play link and fixed typos
Submit the order correctly by updating the `execution`.  Handle the json
error correctly in `MainActivity`
remove unnecessary comment
Add image to readme