Add .globalconfig to solution items #19

Job	Run time
Build (macos-latest, debug)	1m 58s
Build (ubuntu-latest, debug)	37s
Build (windows-latest, debug)	57s
Build (macos-latest, release)	43s
Build (ubuntu-latest, release)	47s
Build (windows-latest, release)	1m 28s
	6m 30s

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