README update and rephrasing, including mention of vcpkg installation… #551

Job	Run time
build (windows-2019, 12.1.1, Visual Studio 16 2019, powershell, windows, -A x64)	6m 56s
build (windows-2019, 12.0.1, Visual Studio 16 2019, powershell, windows, -A x64)	6m 57s
build (windows-2019, 11.8.0, Visual Studio 16 2019, powershell, windows, -A x64)	13m 22s
build (windows-2019, 11.7.0, Visual Studio 16 2019, powershell, windows, -A x64)	6m 45s
build (windows-2019, 11.6.2, Visual Studio 16 2019, powershell, windows, -A x64)	10m 47s
build (windows-2019, 11.6.1, Visual Studio 16 2019, powershell, windows, -A x64)	6m 14s
build (windows-2019, 11.6.0, Visual Studio 16 2019, powershell, windows, -A x64)	6m 9s
build (windows-2019, 11.5.0, Visual Studio 16 2019, powershell, windows, -A x64)	7m 13s
build (windows-2019, 11.4.0, Visual Studio 16 2019, powershell, windows, -A x64)	7m 54s
build (windows-2019, 11.3.0, Visual Studio 16 2019, powershell, windows, -A x64)	5m 31s
build (windows-2019, 11.2.2, Visual Studio 16 2019, powershell, windows, -A x64)	5m 36s
build (windows-2019, 11.1.1, Visual Studio 16 2019, powershell, windows, -A x64)	7m 59s
build (windows-2019, 11.0.3, Visual Studio 16 2019, powershell, windows, -A x64)	5m 19s
	1h 36m 42s

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