"Who will come to the lesson" dashboard

Attendance dashboard -- an app to check the amount of students planning to attend the class.

**Problem**
In master's programme most practice lessons are intended for defending lab works, which is usually a process of students providing answers to teachers' questions. Sometimes there are no students attending the class to present their works, which creates a case of teacher encrountering an empty class.

For a teacher, this ultimately causes two forms of inconvenience:
- time spent on the way to the class;
- time spent in an empty classroom till the end of class.

**Solution**
The proposed solution is an app allowing students to mark their plans on attending the class. These marks are visible to the teacher.

Basic description of the app's mechanism is as folows:
- students select whether they will or will not attend the class;
- for attending the class, there are two possible options -- `offline` or `online`;
- with the dashboard filled in by students, teacher can decide on how to hold a class session, which materials to present and plan the amount of dedicated time to students' lab works accordingly.

**Simplified cases**
- if there are no students planning to attend the class, teacher can cancel the trip to university;
- if all of the students planning to attend the class selected the `online` option, teacher can create a remote online-only session from any suitable space.