Add Code Formatting (#331)

[furudbat]

Hello,
I added my .clang-format mixed with nuklear_console .clang-format changes.

I also tried to close as possible to raylib CONVENTIONS:
The Name convention can be forced with .clang-tidy readability-identifier-naming.*.

• ALWAYS initialize all defined variables.
• Do not use TABS, use 4 spaces instead.
• Avoid trailing spaces, please, avoid them
• Control flow statements always are followed by a space Use more common~~/"modern"~~ C++ style, see BraceWrapping
• Directories will be named using snake_case (see examples/), C++ files are always PascalCase and with an .hpp-extension, avoid confusion with .h C files
• C raylib uses right-alignment pointers, my and RobLoach's .clang-format uses left-align pointers

I try to make the style as close as possible to raylib AND modern C++, @RobLoach pls verify this style and use it from now on, make changes as you wishes ... after that I would recommend formatting the code before/after mergen an PR.
(Use the formatted files as a "preview")

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For convince, I added a CMake command format, I personally using Format.cmake, making a simple command does the job (I'm sure there are better solutions)

[RobLoach]

Thanks so much! Looks great.