fix: add changelog

gitmkn · gitmkn · commit 33d3a8d994d9 · 2024-08-30T18:30:29.000+08:00
diff --git a/.changelog/2800.txt b/.changelog/2800.txt
@@ -0,0 +1,3 @@
+```release-note:enhancement
+tencentcloud_mysql_readonly_instance: Read-only instance creation supports setting read-only groups.
+```

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	+```release-note:enhancement
	`2`	`+tencentcloud_mysql_readonly_instance: Read-only instance creation supports setting read-only groups.`
	`3`	+```