Rewrite of email announcement in plain text.

Author: JaninaSajka

messaging/wai-announce-email.md

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+Dear WAI Interest Group,
+
+W3C WAI invites you to comment on the First Public Working Draft of:
+
+WAI-Adapt Registry for AAC Symbols
+
+https://www.w3.org/TR/adapt-registry/
+
+*** Overview***
+
+\*The WAI-Adapt Registry provides an extensible registry for the Blissymbolics Communication International (BCI) concept index. This index provides a mapping between concepts expressed in standard text and  corresponding symbols in major Augmentative and Alternative Communication (AAC) symbol sets in use today.
+
+For in-progress updates to the document, see the Editors' Draft at:
+
+https://w3c.github.io/adapt-registry/
+
+To comment, please use one of the following two methods:
+
+* By GitHub:
+please open a new issue in the [WAI-Adapt GitHub repository](https://github.com/w3c/adapt/issues/new).
+
+* By email:
+Please send comments in e-mail to . Include \[Registry\]
+as the beginning of your subject line in your email message.
+
+Whether you comment in a github issue or by email, please create separate
+GitHub issues (or email messages) for each topic you address, rather than commenting on multiple topics
+in a single issue (or email).
+
+Please send comments by Friday 13 January 2023.
+
+***Share***
+
+We encourage you to share this information widely. Please include @w3c_wai, @w3c,
+#accessibility, #a11y, @@ Here's a tweet text you can use:
+
+W3C announces the First Public Working Draft of *WAI-Adapt Registry for AAC Symbols*: https://www.w3.org/TR/adapt-registry/, providing first-time support for interoperable Augmentative and Alternative Communication (AAC) symbols support in web content.
+
+Regards,
+
+Sharon D Snider and Lionel Wolberger, Task Force Facilitators.
+
+Janina Sajka and Matthew Atkinson, APA Working Group Co-Chairs
+
+Roy Ran, W3C Staff Contact for APA Working Group