radicale: [NEW] Python-based CalDAV/CardDAV Server

Inspired by OpenWrt Ticket System Ticket 9119
Python3 package currently marked as @BROKEN because no time for testing.

Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>

net/radicale/files/config.template

@@ -0,0 +1,30 @@
+# -*- mode: conf -*-
+# vim:ft=cfg
+
+### AUTO-GENERATED CONFIGURATION
+###      USED BY RADICALE
+###         DO NOT EDIT
+### SEE /etc/config/radicale INSTEAD
+
+[server]
+# daemon		# handled by /etc/init.d/radicale
+# pid			# handled by /etc/init.d/radicale
+
+[encoding]
+
+[well-known]
+
+[auth]
+# htpasswd_filename	# hard-coded /etc/radicale/users
+
+[git]
+
+[rights]
+# file			# hard-coded /etc/radicale/rights
+
+[storage]
+
+[logging]
+# config		# hard-coded /var/etc/radicale/logging
+
+[headers]