Clang Arduino Mega 2560 boilerplate/hello world/test project

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If you don't want to participate in harming yourself, it is recommended to follow the lead and migrate somewhere away of GitHub and Micro$oft. Here is the list of alternatives and rationales to do it. If they delete the discussion, there are certain well-known places where you can get a copy of it. Read why you should also leave GitHub.

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This is a test project, allowing one to test building a program for Arduino Mega 2560 board using Clang.

Prereqs:

• ninja installed.
• Clang-15 - can be installed from https://apt.llvm.org/

Despite using CMakeFiles dir, CMake is not needed.

Files:

• toolchain.ninja - downloads and patches the "latest" (by the time the repo was created) version of Arduino toolchain.
• build.ninja - builds the project, calls toolchain.ninja