Extract settings into config file, add documentation

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+# Lid driven cavity
+
+This example models the common lid driven cavity example.
+Note that the actual optimized C++ implementation is generated using the _boltzgen_ library.
+
+See `config.py` for various configuration options. Both 2D and 3D are supported.
+
+## Build instructions
+
+```
+mkdir build
+cd build
+cmake ..
+make
+./ldc
+```
+
+This should result in some summarizing CLI output in addition to a `test.vtk` file for visualization in Paraview.