📝 add readme

Author: JonasDoebertin

README.md

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+# Today Card for Home Assistant
+
+[![HACS][hacs-badge]][hacs-url]
+[![Release][release-badge]][release-url]
+
+<!-- Badges -->
+
+[hacs-badge]: https://img.shields.io/badge/hacs-default-orange.svg?style=flat-square
+[release-badge]: https://img.shields.io/github/v/release/JonasDoebertin/ha-today-card?style=flat-square
+
+<!-- References -->
+
+[hacs-url]: https://github.com/hacs/integration
+[release-url]: https://github.com/JonasDoebertin/ha-today-card/releases