Merge branch 'add-schedule' into 'master'

add course schedule

See merge request !200

schedule.md

+## Schedule of DuMux Course, April 3-5, 2023 
+
+### Monday, April 3
+
+| Time | Title | 
+|------|-------|
+| 10:00-10:30 | Welcome coffee |
+| 10:30-12:30 | Introduction to DuMux |
+| 12:30-13:30 | Lunch break |
+| 13:30-15:30 | Setting up a test problem / application |
+| 15:30-16:00 | Coffee break |
+| 16:00-17:00 | Runtime parameters and grids |
+| 17:00-17:30 | Python bindings |
+| from 19:00  | Dinner at [Wirtshaus Lautenschlager](https://goo.gl/maps/t2dJSdr9wHQGYWYRA) |
+
+### Tuesday, April 4
+
+| Time | Title |
+|------|-------|
+| 09:00-10:30 | The DuMux property system |
+| 10:30-11:00 | Coffee break |
+| 11:00-12:30 | Material system |
+| 12:30-13:30 | Lunch break |
+| 13:30-14:30 | Setting up a new Dune module |
+| 14:30-15:30 | Implementing a new DuMux model |
+| 15:30-16:00 | Coffee break |
+| 16:00-17:00 | Implementing a new DuMux model (ctd.) |
+| 17:00-17:30 | Discussion on participants' wishes |
+
+### Wednesday, April 5
+
+| Time | Title |
+|------|-------|
+| 09:00-10:00 | The DuMux multidomain framework |
+| 10:00-10:30 | Project areas of the SFB 1313 |
+| 10:30-11:00 | Coffee break |
+| 11:00-11:30 | Project areas of the SFB 1313 (ctd.) |
+| 11:30-12:30 | Individualized exercises and group work |
+| 12:30-13:30 | Lunch break |
+| 13:30-15:30 | Individualized exercises and group work |
+| 15:30-16:00 | Feedback round and farewell |
+