Python-pytm

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* added new command summary.
* fixed bug and refactored invoice handler.
* added tests for project handler.
* added tests for task handler.
* added tests for invoice handler.
* updated make command to update README coverage percentage while testing.

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* added new command rename for renaming existing projects.
* added new command rename for renaming existing tasks.
* updated show command to show active task and project when available.
* Simplified project start command.
* New projects can be started without project name.
* Project started without a name will now have a default name which can be renamed later.
* Simplified task start command.
* New tasks can be started without task name.
* Task started without a name will have a default name which can be renamed later at ease.
* Bug fix

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* config invoice command bug fix.
* copy logo instead of moving it permanently when configuring invoice.
* fixed f strings quote issue.
* made init command hidden.
* improved doc strings and help texts.

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* Made the init command optional.

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* Bug fix.

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* Major bug fix.