Mention pimsync in the list of programs

Author: WhyNotHugo

content/_index.md

@@ -3,3 +3,4 @@ pimutils is a suite of programs for managing contacts, calendars and tasks on th
 * [khal](https://github.com/pimutils/khal) is a command line interface calendar application
 * [todoman](https://github.com/pimutils/todoman) is a command line interface tasks manager
 * [vdirsyncer](https://github.com/pimutils/vdirsyncer) can synchronize calendar data, including data from khal and todoman
+* [pimsync](https://pimsync.whynothugo.nl/) is a re-implementation of vdirsyncer addressing outstanding issue and limitations.