Add .vs (folders automatically generated by Visual Studio) to .gitignore #342

Job	Run time
windows (shared)	1m 21s
windows (static)	55s
posix (linux, clang, shared)	17s
linter	49s
posix (linux, clang, shared, ASan)	26s
posix (linux, clang, static)	23s
posix (linux, clang, static, ASan)	24s
posix (linux, gcc, shared)	9s
posix (linux, gcc, shared, ASan)	21s
posix (linux, gcc, static)	23s
posix (linux, gcc, static, ASan)	44s
posix (macos, clang, shared)	27s
posix (macos, clang, static)	11s
posix (macos, clang, static, ASan)	43s
	7m 33s

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