New cpp folder structure

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

libs/geometry/line2d.hpp

@@ -0,0 +1,28 @@
+#pragma once
+
+#include "geometry/point2d.hpp"
+#include "geometry/segment2d.hpp"
+
+#include "base/assert.hpp"
+
+#include <string>
+
+namespace m2
+{
+
+struct Line2D
+{
+  Line2D() = default;
+
+  explicit Line2D(Segment2D const & segment) : m_point(segment.m_u), m_direction(segment.Dir()) {}
+
+  Line2D(PointD const & point, PointD const & direction) : m_point(point), m_direction(direction) {}
+
+  PointD m_point;
+  PointD m_direction;
+};
+
+IntersectionResult Intersect(Line2D const & lhs, Line2D const & rhs, double eps);
+
+std::string DebugPrint(Line2D const & line);
+}  // namespace m2