use modern cmake commands

README.md

@@ -8,10 +8,8 @@ A library for building FOSS Games, Educational Resources and Academic Experiment
 It's designed to be a fairly standard cmake project, so the standard cmake steps should work:
 
 ```bash
-mkdir build
-cd build
-cmake ..
-make
+cmake -S . -B build -DCMAKE_BUILD_TYPE=Debug
+cmake --build build
 ```
 
 The library should also build the test scene (`demo`). There is a shellscript in the root of the