[Tasks]: Add more resources about BBC BASIC programming on RISC OS

[pzaino]

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Background

The list of BBC BASIC programming resources is still small compared to what is available.

We need to add more resources like:

• Books
• Websites
• info (blog articles etc., your own blog articles are totally fine)
• Code Snippets in the Code Snippets BBC BASIC section
• Videos (in any available)

See list of resources here to see where to add your material.

Before accepting the task please make sure you have read the contributing guide lines here and the Code of Conduct here, thanks.

When completed this task, make sure you open a Pull Request (PR) of your changes to the develop branch and request a review to the code-reviews team.

Definition of Done

• [x] Add a list of books about coding in BBC BASIC on RISC OS (at least 3)
• [x] Add a list of websites that covers the matter (at least 1)
• [x] Add a list of articles/forum topics on the matter (at least 3)
• [x] Added some code snippets in the Code Snippets BBC BASIC section

Code of Conduct

• [x] I agree to follow this project's Code of Conduct

[pzaino]

This can be closed now, we added @Gerph resources list for BBC BASIC which is full of examples and code snippets.