Add TODO file for bext #122

Job	Run time
Ubuntu GCC Debug Build	37m 51s
Ubuntu GCC Release Build	44m 52s
macOS Clang Debug Build	1h 12m 7s
macOS Clang Release Build	1h 15m 36s
MSVC - Ninja Debug build	43m 50s
MSVC - Ninja Release build	1h 17m 28s
MSVC - Standard Tools Release Build	1h 32m 11s
MSVC - Standard Tools Debug Build	1h 5m 56s
	8h 29m 51s

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