Create portals/ directory and metadata.
diff --git a/portals/META.yml b/portals/META.yml
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+++ b/portals/META.yml
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+spec: https://wicg.github.io/portals/
+suggested_reviewers:
+ - jeremyroman
+ - lucasgadani
diff --git a/portals/README.md b/portals/README.md
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+# Portals
+
+This directory contains tests for the portals feature, which seeks to enable
+seamless navigation. For more information, see:
+
+* https://github.com/WICG/portals
+* https://wicg.github.io/portals/
+
+This feature is currently in early development.
