Copy v19.0.0-RC1 release notes on main (#267)

Signed-off-by: Florent Poinsard <florent.poinsard@outlook.fr>

changelog/19.0/19.0.0/changelog.md

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+# Changelog of Vitess v19.0.0
+
+### Other 
+#### Other
+ * add update go deps workflow [#220](https://github.com/frouioui/vitess/pull/220)
+### Release 
+#### General
+ * Copy `v18.0.2` release notes on `main` [#213](https://github.com/frouioui/vitess/pull/213)
+ * [release-19.0] Code Freeze for `v19.0.0-RC1` [#241](https://github.com/frouioui/vitess/pull/241)
+ * [release-19.0] Release of `v19.0.0-RC1` [#244](https://github.com/frouioui/vitess/pull/244)
+ * Copy `v19.0.0-RC1` release notes on `main` [#245](https://github.com/frouioui/vitess/pull/245)
+ * [release-19.0] Bump to `v19.0.0-SNAPSHOT` after the `v19.0.0-RC1` release [#247](https://github.com/frouioui/vitess/pull/247)
+ * Bump to `v20.0.0-SNAPSHOT` after the `v19.0.0-RC1` release [#249](https://github.com/frouioui/vitess/pull/249)
+ * [release-19.0] Code Freeze for `v19.0.0-RC1` [#257](https://github.com/frouioui/vitess/pull/257)
+ * Bump to `v20.0.0-SNAPSHOT` after the `v19.0.0-RC1` release [#258](https://github.com/frouioui/vitess/pull/258)
+ * [release-19.0] Release of `v19.0.0-RC1` [#259](https://github.com/frouioui/vitess/pull/259)
+

changelog/19.0/19.0.0/release_notes.md

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+# Release of Vitess v19.0.0
+The entire changelog for this release can be found [here](https://github.com/frouioui/vitess/blob/main/changelog/19.0/19.0.0/changelog.md).
+
+The release includes 10 merged Pull Requests.
+
+Thanks to all our contributors: @frouioui
+

changelog/19.0/README.md

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 ## v19.0
 * **[19.0.0](19.0.0)**
+	* [Changelog](19.0.0/changelog.md)
+	* [Release Notes](19.0.0/release_notes.md)