InteractionDesignFoundation#21 Add info about zoom

guides/collaboration-tools.md

@@ -21,6 +21,12 @@ We also use real face photos for a profile picture to look more friendly to your
 [Skype](https://go.skype.com/scom.download) is our preferred tool to take video calls. Make sure to add the rest of the team to your Skype contacts.
 For contact information of your team members, take a look at the file `IDF Onboarding - Team Members Contact Info` in the shared folder `IDF - Staff - Hiring - Onboarding documents and legal templates`.
 
+### [Zoom](https://zoom.us)
+
+To set up a Zoom meeting, [sign up for a free basic account](https://zoom.us/signup) using your IDF team email address,
+and share the link for your "personal meeting room" with your participants.
+Note that on the Basic license, meetings are capped at 100 people, and meeting durations are capped at 40 minutes.
+
 ### [Google Hangouts](https://hangouts.google.com/)
 
 When both Slack (video) and Skype fail, we use [Google Hangouts](https://hangouts.google.com/) for video calls.