Add .vs (folders automatically generated by Visual Studio) to .gitignore #345

Job	Run time
linter	38s
windows (shared)	1m 9s
posix (linux, clang, shared)	16s
windows (static)	56s
posix (linux, clang, shared, ASan)	24s
posix (linux, clang, static)	17s
posix (linux, clang, static, ASan)	21s
posix (linux, gcc, shared)	10s
posix (linux, gcc, shared, ASan)	17s
posix (linux, gcc, static)	10s
posix (linux, gcc, static, ASan)	16s
posix (macos, clang, shared)	30s
posix (macos, clang, static)	11s
posix (macos, clang, static, ASan)	51s
	6m 26s

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