try to add description to doxygen

.extra/doxygen/description.md

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+# Locus No Pilotus: Trajectory Calculator
+
+**Project of four first grade MIPT DAFE/RSE students (for engineering practical work in the second semester) in Qt C++**
+
+## 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](https://www.qt.io/) and [QCustomPlot](https://www.qcustomplot.com/). 
+
+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. 
+
+*We strongly recommend that you install our application using the instructions below and try it out!*

.extra/doxygen/doxyfile

@@ -1171,7 +1171,7 @@ FILTER_SOURCE_PATTERNS =
 # (index.html). This can be useful if you have a project on for instance GitHub
 # and want to reuse the introduction page also for the doxygen output.
 
-USE_MDFILE_AS_MAINPAGE =
+USE_MDFILE_AS_MAINPAGE = .extra/doxygen/description.md
 
 # The Fortran standard specifies that for fixed formatted Fortran code all
 # characters from position 72 are to be considered as comment. A common