Docs: tutorials

[gynt]

A first tutorial should cover the basic workflow (see #60):

1. Creating the files
2. Including the files for compilation
3. Polishing basic quirks from Ghidra: converting direct access to field access, including enum values, global data access and this-pointers.
4. Comparing compilation against the original binary
5. Improving the reimplementation
6. Documenting progress or status and filing a PR

A different tutorial should cover:

1. Calling other functions using the macro's
2. How to deal with _ functions (lib functions)
3. Which other functions to ignore (e.g., ADJ())

Another tutorial should cover:

1. How to import the database into Ghidra to get decompilations.