Add verbalization of symbols that are unsupported by TTS/TalkBack

Bug: 13336905
Change-Id: Iefd117fa7b30b8ba240590b13b03d7044fd37ede
diff --git a/java/res/values/strings-emoji-descriptions.xml b/java/res/values/strings-emoji-descriptions.xml
index 7952a7f..8cbde26 100644
--- a/java/res/values/strings-emoji-descriptions.xml
+++ b/java/res/values/strings-emoji-descriptions.xml
@@ -17,6 +17,10 @@
 ** limitations under the License.
 */
 -->
+<!--
+    These Emoji symbols are unsupported by TTS.
+    TODO: Remove this file when TTS/TalkBack support these Emoji symbols.
+-->
 <resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
      <!-- Spoken description for Unicode code point U+00A9: "©" COPYRIGHT SIGN -->
      <string name="spoken_emoji_00A9">Copyright sign</string>