[Tasks]: Add a set of code Snippets in C that works on both GCC and DDE compilers

[pzaino]

Contact Details (optional)

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Background

Add an initial set of code snippets in C for both GCC and DDE compilers, to help people starting their own projects in C on RISC OS. Code snippets should be added here under the C section.

Code snippets should be specific for RISC OS coding (so not generic ones).

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 at least 3 or 4 code snippets that do something useful using SWI or WIMP

Code of Conduct

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

[pzaino]

This can be closed now, we have a repository with ANSI C99 code examples and snippets.