adding brainflow project for matlab, prepared toolbox #900

Job	Run time
CppUnix (Release, ubuntu-latest)	8m 57s
CppUnix (Release, macos-11.0)	7m 58s
CppUnix (Debug, ubuntu-latest)	7m 53s
CppUnix (Debug, macos-11.0)	5m 26s
CppWindows (static, Release, Win32)	5m 47s
CppWindows (static, Release, x64)	6m 11s
CppWindows (static, Debug, Win32)	5m 3s
CppWindows (static, Debug, x64)	5m 26s
CppWindows (dynamic, Release, Win32)	5m 52s
CppWindows (dynamic, Release, x64)	6m 31s
CppWindows (dynamic, Debug, Win32)	5m 7s
CppWindows (dynamic, Debug, x64)	4m 36s
	1h 14m 47s

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