Initial commit: Go 1.23 release state

doc/initial/1-intro.md

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+<!--
+NOTE: In this document and others in this directory, the convention is to
+set fixed-width phrases with non-fixed-width spaces, as in
+`hello` `world`.
+-->
+
+<style>
+  main ul li { margin: 0.5em 0; }
+</style>
+
+## DRAFT RELEASE NOTES — Introduction to Go 1.N {#introduction}
+
+**Go 1.N is not yet released. These are work-in-progress release notes.
+Go 1.N is expected to be released in {Month} {Year}.**