caldav/carddav in linux: added todoman and put vdirsyncer into own entry

wiki/linux/todoman.md

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+# Todoman
+
+`todoman` is a todolist you can use in your terminal.
+You can sync it using [vdirsyncer](vdirsyncer.md)
+
+## Setup
+
+### Arch-Linux
+
+- `pacman -S todoman` - Install needed packages
+
+### Configuration
+
+- Edit the `~/.config/todoman/todoman.conf`
+  - Insert the following lines
+
+```txt
+[main]
+path = ~/.local/share/pim/calendars/*/*
+date_format = %d.%m.%Y
+time_format = %H:%M
+default_list = personal
+```
+
+Replace `personal` with your choice of primary list and
+`~/.local/share/pim/calendars/*/*` with the path to your calendars.