amount_input 0.0.5

Allow the user to input the amount from the back

0.0.1 TODO: 12.45am 8 June 2020.

• TODO: Describe initial release.

0.0.2 TODO: 12.46am 8 June 2020.

• Simplify the implemetation

0.0.4+4 TODO: 2.07am 8 June 2020.

• Fix the implementation error and renew the README.md

0.0.4+5 TODO: 12.11pm 8 June 2020.

• updated the README.md

0.0.5 TODO: 12.20pm 8 June 2020.

• updated the README.md