Create AMBASSADORS.md (#13982)

* Create AMBASSADORS.md

Signed-off-by: Flynn <flynn@buoyant.io>

* Lint fix

Signed-off-by: Flynn <flynn@buoyant.io>

* Typo fix

Signed-off-by: Flynn <flynn@buoyant.io>

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Signed-off-by: Flynn <flynn@buoyant.io>

AMBASSADORS.md

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+# Linkerd Ambassadors
+
+The Linkerd Ambassador badge is a distinction awarded to those community
+members who are experts in their field and who demonstrate expertise, passion,
+engagement, and a commitment to sharing their Linkerd experience with the
+broader community. Linkerd Ambassadors are hand-picked by the Linkerd
+maintainers.
+
+Interested in becoming a Linkerd Ambassador? Learn more at
+<https://linkerd.io/community/ambassadors/>.
+
+## Current Ambassadors
+
+- 🇺🇸 Chris Campbell, @campbel
+- 🇩🇪 Christian Hüning, @christianhuening
+- 🇭🇺 Dominik Táskai, @dtaskai
+- 🇮🇱 Eli Goldberg, @Eli-Goldberg
+- 🇬🇧 Mahendran Selvakumar, @skmahe1077
+- 🇬🇹 Sergio Méndez, @sergioarmgpl
+- 🇳🇱 William Rizzo, @wrkode
+
+## Ambassadors Emeriti
+
+- 🇺🇸 Charles Pretzer, @cpretzer
+- 🇳🇴 Fredrik Klingenberg, @fredrkl
+- 🇩🇰 Kasper Nissen, @kaspernissen
+- 🇵🇹 María Teresa Rojas, @mtrojas
+- 🇦🇺 Steve Gray