Adding is_empty() and print_csv() funtions to project.

[shashaaankkkkk]

Type of change

• [ in view and update expenses , program is not checking db is empty or not ] Bug fix
• [ is_empty() and print_csv() ] New features

Changes proposed in this pull request

is_empty() function is used to check db is empty for not and
print_csv() function is used to export all the expenses which is registered in db will be print to csv and in last of csv total expense also mentions .

• Project name : Expense Tracker

• Short description : To track the expenses with we do in our daily bases

Checklist

• [* ] The code is Python 3 compatible
• [ *] I have added relevant comments in my file to make code understandable
• [ *] I have added my project in a folder which includes all the necessary files

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[Mrinank-Bhowmick]

Thanks for contributing #322