feat: add module mp_units

example/measurement.cpp

@@ -20,13 +20,17 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 // SOFTWARE.
 
+#include <cmath>
+#include <exception>
+#include <iostream>
+#ifdef MP_UNITS_MODULES
+import mp_units;
+#else
 #include <mp-units/ostream.h>
 #include <mp-units/systems/isq/space_and_time.h>
 #include <mp-units/systems/si/unit_symbols.h>
 #include <mp-units/systems/si/units.h>
-#include <cmath>
-#include <exception>
-#include <iostream>
+#endif
 
 namespace {