[Fix] 添加gitignore，忽略掉CMake的临时文件，还有build/文件夹
[Fix] 添加gitignore，忽略掉CMake的临时文件，还有build/文件夹

msincenselee/vnpy,bigdig/vnpy,bigdig/vnpy,msincenselee/vnpy,vnpy/vnpy,andrewchenshx/vnpy,bigdig/vnpy,rrrrrr8/vnpy,andrewchenshx/vnpy,rrrrrr8/vnpy,rrrrrr8/vnpy,rrrrrr8/vnpy,bigdig/vnpy,rrrrrr8/vnpy,msincenselee/vnpy,rrrrrr8/vnpy,andrewchenshx/vnpy,andrewchenshx/vnpy,andrewchenshx/vnpy,msincenselee/vnpy,vnpy/vnpy