README: link to more information about cmake

Author: ethomson

README.md

@@ -225,6 +225,8 @@ On most systems you can build the library using the following commands
 
 Alternatively you can point the CMake GUI tool to the CMakeLists.txt file and generate platform specific build project or IDE workspace.
 
+If you're not familiar with CMake, [a more detailed explanation](https://preshing.com/20170511/how-to-build-a-cmake-based-project/) may be helpful.
+
 Running Tests
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