Added a how-to for visual studio.

Author: martinfjohansen

VisualStudioHowTo.md

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+Download pbPlots.cpp, pbPlots.hpp, supportLib.cpp, supportLib.hpp from version [pbPlots 0.1.7.3](https://github.com/InductiveComputerScience/pbPlots/tree/v0.1.7.2).
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+Right-click on the project name and press "Open folder in file explorer".
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+![Image 1](images/VS1.png "Image 1")
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+Select then drag and drop the files into the folder.
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+![Image 2](images/VS2.png "Image 2")
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+Right-click on the project name, go into "Add" press "Existing item...".
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+![Image 3](images/VS3.png "Image 3")
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+Select the four files in the project folder.
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+![Image 4](images/VS4.png "Image 4")
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+The program should now compile successfully. Copy the code from example1.cpp to produce a plot.
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+![Image 5](images/VS5.png "Image 5")
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+Good luck!