add mainpage to doxygen

mainpage.dox

@@ -0,0 +1,27 @@
+/**
+ * @mainpage Locus No Pilotus: Trajectory Calculator
+ *
+ * @section intro About
+ * Project of four first grade MIPT DAFE/RSE students (for engineering practical
+ * work in the second semester) in Qt C++.
+ *
+ * @section description Description
+ * In this project, we are developing an application that calculates the
+ * trajectory of a flying delivery robot that collects valuable cargo from
+ * control points: Targets. On its way, it may encounter high mountains that
+ * it cannot fly over: Hills; or elliptical territories that are impossible
+ * to visit due to climate conditions: TrappyCircles. Also, through some
+ * control points, the robot is simply unable to move, as the cargo may not be
+ * ready for transportation at that time, these are TrappyLines.
+ *
+ * The robot's trajectory is calculated using several mathematical algorithms:
+ * [...]. The graphical interface for constructing the trajectory was created
+ * using Qt and QCustomPlot.
+ *
+ * In the application, you can add objects using window forms, interact with the
+ * trajectory calculation plot using the mouse cursor, create and open files in
+ * .json format with a specific style for this application. Editing objects can
+ * also be done with cursors or using a special dynamic input field with tables,
+ * opened in a separate window mode or embedded in the main one.
+ *
+ */