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

wiki/linux/vdirsyncer.md

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+# Vdirsyncer
+
+`vdirsyncer` can sync calendars and contacts using the caldav and carddav
+protocol.
+
+## Setup
+
+### Arch-Linux
+
+- `pacman -S vdirsyncer` - Install needed packages
+
+### Configuration
+
+- Edit the `~/.config/vdirsyncer/config`.
+  - Insert the following lines:
+
+```txt
+[general]
+status_path = "~/.cache/vdirsyncer/status"
+
+#calendar
+[pair private_calendar]
+a = "private_calendar_local"
+b = "private_calendar_remote"
+collections = ["from a", "from b"]
+metadata = ["color"]
+
+[storage private_calendar_local]
+type = "filesystem"
+path = "~/.local/share/pim/calendars/private_calendar"
+fileext = ".ics"
+
+[storage private_calendar_remote]
+type = "caldav"
+url = "https://<url>"
+auth = "basic"
+username = "<username>"
+password = "<password>"
+
+#contacts
+[pair private_contacts]
+a = "private_contacts_local"
+b = "private_contacts_remote"
+collections = ["from a", "from b"]
+
+[storage private_contacts_local]
+type = "filesystem"
+path = "~/.local/share/pim/contacts"
+fileext = ".vcf"
+
+[storage private_contacts_remote]
+type = "carddav"
+url = "https://<url>"
+username = "<username>"
+password = "<password>"
+auth = "basic"
+```
+
+Replace specific lines with your information.
+You can set multiple contact and calendar syncs at once.
+
+- `vdirsyncer discover && vdirsyncer metasync` - Initialize vdirsyncer
+- `vdirsyncer sync` - Synchronize your data (put it in a crontab to run periodically)