Add speakers page and navigation

Luca and Dave have committed to participate to the
Gerrit User Summit 2018: add them as speakers.

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 * [Home](/index.md)
 * [Location](/location.md)
 * [Schedule](/schedule.md)
+* [Speakers](/speakers.md)
 * [Overview](/overview.md)
 * [Conduct Policy](/conduct-policy.md)
 * [Propose a Talk](/cfp.md)
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+# Gerrit User Summit 2017 - Speakers
+
+### Dave Borowitz - Google {#dborowitz}
+
+[LinkedIn](https://www.linkedin.com/in/dborowitz/)
+
+Dave Borowitz is Staff Software Engineer at Google and principal
+project maintainer.
+
+### Luca Milanesio - GerritForge {#lmilanesio}
+
+[LinkedIn](https://www.linkedin.com/in/lucamilanesio/)
+
+Luca is co-founder of GerritForge and has over 20 years of software development
+and application lifecycle management experience.
+He is a Gerrit Contributor for over five years and is the maintainer
+of [GerritHub.io](https://gerrithub.io), the Open Service for Gerrit Code Review
+on top of GitHub repositories.
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