Python-pytm

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* open invoices using python's standard library.
* code refactor
* bug fix

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* Added config invoice command for configuring default invoice texts and logo.
* Added invoice sub command.
* Added invoice manual command to generate manual invoice using prompts.
* Added invoice auto <Project> command to generate invoice from existing projects.
* invoice manual and auto command generates HTML invoices using Tailwind CSS and opens it in a Browser.

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* Added config sub command.
* added command to save default user information.
* refactored project and task commands.
* fixed bugs.
* added config command to configure project meta data such as title, billable? etc.

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* Added show sub command for project.
* Added json sub command for project.
* refactored project and task commands output messages.
* fixed bugs in project sub commands.

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* bug fix
* readme and doc update
* Improved Command line interface outputs.

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* Made task commands functional.
* Improved project summary.
* Project summary now shows total duration of the project.