Update README.md

Updated README to add example of setting OpenCV_DIR in cmake command
spmallick · Feb 21, 2019 · 91b87dc · 91b87dc
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diff --git a/QRCode-OpenCV/README.md b/QRCode-OpenCV/README.md
@@ -6,7 +6,15 @@ This directory contains code for using OpenCV QR code. This code requires **Open
 # For C++
 
 ## How to compile the code
-First Specify the **OpenCV_DIR** in CMakeLists.txt file. Then,
+
+Specify the **OpenCV_DIR** in CMake option
+
+```
+cmake -D OpenCV_DIR=<path to opencv install directory>/lib/cmake/opencv4/ .
+make
+```
+
+OR First Specify the **OpenCV_DIR** in CMakeLists.txt file. Then,
 
 ```
 cmake .