Document support for Icons (FontAwesome)

[hendrikebbers]

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👾 Description of the issue

It is really helpful to have a set of icons that can be used in documentation. AsciiDoc provides support for icons and this doc already uses some of them. We want to use vector based icons and not image / pixel based icons in our documentations. Therefore the support for font based icons in AsciiDoc sounds like a good idea. This is based on Font Awesome. We should provide a short documentation regarding the usage of such icons in the documentation. Next to this an information of the supported Font Awesome version would be good.

📋 Step by Step

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• [ ] Claim this issue: Comment below.
• [ ] Fork the repository in github by simply clicking the 'fork' button.
• [ ] Check out the forked repository
• [ ] Create a feature branch for the issue. We do not have any naming definition for branches.
• [ ] Commit your changes.
• [ ] Start a Pull Request.
• [ ] Done 👍 Ask in comments for a review :)
• [ ] If the reviewer find some missing peaces or a problem he will start a discussion with you and describe the next steps how the problem can be solved.
• [ ] You did it 🎉 We will merge the fix in the master branch.
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[TSK2302]

@hendrikebbers can I work on this issue? Also, can you tell me what's expected of the documentation in terms of length and structure? Can this be considered as an example of what I'm expected to deliver in PDF/ HTML format?