Add hello spell checker sample client app

Bug: 4973788

Change-Id: I938ba499c35d91f2e9dbcd00ae0df64c999b2b95
diff --git a/samples/SpellChecker/_index.html b/samples/SpellChecker/_index.html
new file mode 100644
index 0000000..d60c8ca
--- /dev/null
+++ b/samples/SpellChecker/_index.html
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+<p>A set of samples that demonstrate how to create/use spell checker APIs.</p>