added description of presets

10_presets/README.md

@@ -11,12 +11,12 @@ Presets are based on two main files.
 
 Presets have a name and specify flags for the configure, build, test, install, etc stage.
 To invoke a preset configuration during the configure stage use e.g.
-`
-cmake --preset <ConfigurePreset> -S <SourceDirectory> -B <BuildDirectory>
-`
+`cmake --preset <ConfigurePreset> -S <SourceDirectory> -B <BuildDirectory>`
 or during the build stage use
-`
-cmake --preset <BuildPreset> --build <BuildDirectory>
-`
-How this minimal example is used in a CMake workflow is shown in [.gitlab-ci.yml](../.gitlab-ci.yml)
-Many further details can be found in the CMake documentation for presets [](https://cmake.org/cmake/help/latest/manual/cmake-presets.7.html)
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+`cmake --preset <BuildPreset> --build <BuildDirectory>`.
+
+## Example
+This recipe contains two configure presets as an example. The development preset can be selected like this,
+`cmake --preset dev -S <SourceDirectory> -B <BuildDirectory>`. It uses `g++` as a compiler and enables compiler warnings.
+If you build you will see a warning printed. In contrast, the `production` preset does not enable compiler warnings,
+but optimization flags. A build with this configuration does not show warnings.
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