[Docs]: 7GUIs Examples

[iwr-redmond]

Overview

The 7GUIs Programming Benchmark demonstrates how particular GUI toolkits can be used to solve common problems. The snippets created as part of addressing the 7 Tasks would provide excellent starter code for developers wishing to adopt TkEasyGUI.

Background

The TKEasyGUI repository already includes a range of snippets in the tests folder. This FR would result in more sophisticated examples being available for easy comparison with many other GUI toolkits, including Edifice.

Proposal

Create code that addresses each of the 7 Tasks. You may wish to start with the harder tasks towards the end of the list to determine whether the time will be well spent; there are a number of incomplete implementations that arguably add less value than is desirable.

[kujirahand]

@iwr-redmond Thank you very much for your highly valuable suggestion.

Also, I have implemented all the 7GUIs samples using the latest v1.0.38.

7GUIs Examples:
https://github.com/kujirahand/tkeasygui-python/tree/main/tests/basic_app

Some of the samples were very enjoyable to write because they could be described so simply.

Since samples such as Cells lack spreadsheet functionality and could not be implemented precisely, I decided to add a pseudo-sample instead. I would like to resolve this issue in #138 .