Initial CMake build support#5

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ScatteredRay wants to merge 3 commits intowestquote:mainfrom

ScatteredRay:indy_cmake

Commits on Mar 19, 2022

Initial cmake build support.
ScatteredRay
committed

Commits on Mar 21, 2022

CMake:Only use -fcoroutines for Clang builds.
ScatteredRay
committed

Commits on Mar 22, 2022

Additional cmake work, adding MSVC option arguments, and adding build samples.
ScatteredRay
committed