Merge pull request #411 from vaibhavcisin274/poonam

Poonam
Merge branch 'master' of github.com:vaibhavcisin274/invoice-project into poonam
calculation functionality solve prblem taxex and additional charges
conflicts remove 21-sep
Merge pull request #414 from vaibhavcisin274/poonam

Poonam
Merge pull request #415 from vaibhavcisin274/vaibhav

Vaibhav
change middle contanair size 21-sep
Merge pull request #416 from vaibhavcisin274/vaibhav

change middle contanair size 21-sep
Merge branch 'master' of github.com:vaibhavcisin274/invoice-project into poonam
changes