Update README.md

Author: vba34520

README.md

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 # Classification performance standard
 
 ## Description
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 ## Standard
 
-<img src="https://latex.codecogs.com/png.latex?$Accuracy=\frac{TP&plus;TN}{P&plus;N}$" title="$Accuracy=\frac{TP+TN}{P+N}$" />
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-<img src="http://www.forkosh.com/mathtex.cgi? \Large x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}">
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-<img src="http://www.forkosh.com/mathtex.cgi? Accuracy=\frac{TP+TN}{P+N}">
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-<img src="http://chart.googleapis.com/chart?cht=tx&chl= Accuracy=\frac{TP+TN}{P+N}" style="border:none;">
+<img src="http://chart.googleapis.com/chart?cht=tx&chl= Accuracy=\frac{TP\+TN}{P+N}" style="border:none;">
 
 $$Accuracy=\frac{TP+TN}{P+N}$$