add changelog for v0.1.0 release

CHANGELOG.md

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+<a name="v0.1.0"></a>
+# [v0.1.0](https://github.com/rhysd/tui-textarea/releases/tag/v0.1.0) - 19 Jun 2022
+
+First release :tada:
+
+- GitHub repository: https://github.com/rhysd/tui-textarea
+- crates.io: https://crates.io/crates/tui-textarea
+- docs.rs: https://docs.rs/tui-textarea/latest/tui_textarea/
+
+[Changes][v0.1.0]
+
+
+[v0.1.0]: https://github.com/rhysd/tui-textarea/tree/v0.1.0
+
+ <!-- Generated by https://github.com/rhysd/changelog-from-release -->