Lightning talk on submit requirements

Change-Id: Ie3a9456a96596f2288afaab4e76262df7f0b54f5

schedule.md

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 | 12:00 | Lunch& Networking
 | 14:00 | [Keeping an eye on your repository metrics](sessions/git-repo-metrics.md)
 | 14:10 | [Status update of the "Gerrit on Kubernetes" project](sessions/k8s-gerrit.md)
-| 14:20 | __Lightning talk available__
+| 14:20 | [Submit requirements - Goodbye Prolog](sessions/submit-requirements.md)
 | 14:30 | __Lightning talk available__
 | 14:40 | __Lightning talk available__
 | 14:50 | __Lightning talk available__

sessions/submit-requirements.md

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+# Submit Requirements - Goodbye Prolog
+
+Submit requirements is the new and simpler way with which admins can configure
+submittability rules for their projects, that is, rules that should be satisfied
+before a change can be submittable.
+
+Historically, Gerrit had three different ways to define change submittability:
+label functions, custom submit rules and prolog. The new submit requirement is
+meant to replace them all. The major Google owned gerrit hosts have fully
+migrated to submit requirements including Gerrit, all Chromium and Android among
+others. All other hosts are expected to be fully migrated within the next three
+months.
+
+Youssef will present an overview of submit requirements, how they can be
+configured by host admins and how they are displayed in the change page and the
+dashboard.
+
+This talk will be presented online.
+
+*[Youssef Elghareeb, Google](../speakers.md#ghareeb)*

speakers.md

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 Over the last three years he has been involved in the design and development of
 numerous parts of the Gerrit ecosystem, such as: Gerrit core, multi-site,
 events-broker(Kafka and AWS Kinesis) and pull-replication.
+
+### Youssef Elghareeb - Google {#ghareeb}
+
+[LinkedIn](https://www.linkedin.com/in/youssef-elghareeb/)
+
+Youssef is a Software Engineer at Google since Nov. 2019 and a maintainer of the
+Gerrit open source project. His major contributions to the Gerrit project
+include the redesign of Gerrit's diff cache system and revamping the legacy
+submittability rules in favour of submit requirements.