add a full stack expense tracker project

[ANSHIKA-26]

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📝 Description

I wish to add a full stack expense tracking application to the project list , the app will have a login/signup system,allow users to save expenses , track them and also visualize expenses in form of pie charts etc ,

note - an expense tracker exists in intermediate level projects , but it doesn't have backend , nor the visualize expense feature

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@ANSHIKA-26

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