Update README.md

I think there should be something under ### Resources for example: * Additional OpenCV functionality: <https://github.com/opencv/opencv_contrib>
pestisid-cmd · Aug 6, 2020 · 9f02b87 · 9f02b87
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diff --git a/README.md b/README.md
@@ -7,6 +7,7 @@
 * Docs: <https://docs.opencv.org/master/>
 * Q&A forum: <http://answers.opencv.org>
 * Issue tracking: <https://github.com/opencv/opencv/issues>
+* Additional OpenCV functionality: <https://github.com/opencv/opencv_contrib> 
 
 
 ### Contributing