New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/geometry/meter.hpp

@@ -0,0 +1,19 @@
+#pragma once
+
+namespace m2
+{
+using Meter = double;
+
+inline namespace literals
+{
+inline constexpr Meter operator"" _m(long double value) noexcept
+{
+  return static_cast<double>(value);
+}
+
+inline constexpr Meter operator"" _km(long double value) noexcept
+{
+  return static_cast<double>(value * 1000.0);
+}
+}  // namespace literals
+}  // namespace m2