Add community call reference

Author: clementbiron

content/community/reference/_index.md

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+---
+title: References
+weight: 3
+---

content/community/reference/community-call.jpg

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+---
+title: Community call
+---
+
+# Community call
+
+The Open Terms Archive Community Call is a monthly online meeting for and by the community.
+
+## Ambitions
+
+- **Get up-to-date**: the core team will open the call by highlighting the latest features and 
+- **Discover collections**: on each call, a maintainer will present their collection.
+- **Get support**: the core team will be available to help you track and maintain existing collections.
+
+![]({{< relref "." >}}community-call.jpg)
+
+## Frequency and format
+
+- When: First Wednesday of the month
+- Time: 09:00 - 10:00 UTC
+- Duration: 1 hour
+- Join link: [https://meet.jit.si/OpenTermsArchiveCommunityCall](https://meet.jit.si/OpenTermsArchiveCommunityCall)
+
+
+This information is given for guidance only and may change according to the availability of the organisers and participants. Follow Open Terms Archive on [Mastodon]({{< param mastodon.url >}}) or [LinkedIn]({{< param linkedin.url >}}) for announcements about upcoming calls.