Enhancement: Add Customization Options

[YuneshShrestha]

Description:
I would like to suggest an improvement to the invoice generator app that adds customization options for the users. Customization options allow users to customize the appearance of their invoices to suit their branding and needs.

Requirements:

1. Font Customization: Users should be able to choose different fonts for their invoice text to match their brand or style
   preferences.

2. Color Customization: Provide the ability to select colors for the invoice, including text color, background color, and accent color.

3. Logo Integration: Users should be able to upload their company or personal logo for inclusion in the invoice header.

4. Layout Customization: Allow users to make changes to the payment system, such as setting the recipient information, by sender information, and the contents of the list of goods or services.

5. Header and Footer Customization: Enable users to add custom text or text to the invoice header and footer.

Why this matters:
The customization options will make the invoice generator app more versatile and appealing to many users. Invoices created with the app have a strong professional and personal touch.