Add .vs (folders automatically generated by Visual Studio) to .gitignore #341

Job	Run time
linter	51s
windows (shared)	1m 27s
posix (linux, clang, shared)	12s
windows (static)	1m 0s
posix (linux, clang, shared, ASan)	19s
posix (linux, clang, static)	20s
posix (linux, clang, static, ASan)	49s
posix (linux, gcc, shared)	7s
posix (linux, gcc, shared, ASan)	17s
posix (linux, gcc, static)	7s
posix (linux, gcc, static, ASan)	14s
posix (macos, clang, shared)	31s
posix (macos, clang, static)	12s
posix (macos, clang, static, ASan)	45s
	7m 11s

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