Updated C# guidelines (#120)

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Updated guidelines

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fixed grammar errors

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fixed typo
change consider emoji to be grey question mark

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Co-authored-by: Kevin B <Keboo@users.noreply.github.com>
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Co-authored-by: Kevin B <Keboo@users.noreply.github.com>
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Co-authored-by: Kevin B <Keboo@users.noreply.github.com>
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Co-authored-by: Kevin B <Keboo@users.noreply.github.com>
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Co-authored-by: Kevin B <Keboo@users.noreply.github.com>
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Co-authored-by: Kevin B <Keboo@users.noreply.github.com>
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Co-authored-by: Kevin B <Keboo@users.noreply.github.com>
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Co-authored-by: Kevin Bost <kitokeboo@gmail.com>

Author: edmondsb