Add Quanta-Q71l README

The board is supported although often behind,
in that its configuration is only periodically
updated.

Change-Id: If0d84c9a46eb8b8858305a2737df7eee9d6afe30
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/meta-quanta/meta-q71l/README.md b/meta-quanta/meta-q71l/README.md
new file mode 100644
index 0000000..01315ae
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+Quanta-Q71l
+================
+
+This is the Quanta-Q71l machine layer.
+
+This platform is currently supported, although often behind.