A few template updates (#93)

template/beta/README.md

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+# ESPHome Beta Add-On
+
+[![ESPHome logo][logo]][website]
+
+[![GitHub stars][github-stars-shield]][repository]
+[![Discord][discord-shield]][discord]
+
+## About
+
+This add-on allows you to manage and program your ESP8266 and ESP32 based microcontrollers
+directly through Home Assistant **with no programming experience required**. All you need to do
+is write YAML configuration files; the rest (over-the-air updates, compiling) is all
+handled by ESPHome.
+
+<p align="center">
+<img title="ESPHome dashboard screenshot" src="https://github.com/esphome/home-assistant-addon/raw/main/esphome-beta/images/screenshot.png" width="700px"></img>
+</p>
+
+[View the ESPHome documentation][website]
+
+## Example
+
+With ESPHome, you can go from a few lines of YAML straight to a custom-made
+firmware. For example, to include a [DHT22][dht22].
+temperature and humidity sensor, you just need to include 8 lines of YAML
+in your configuration file:
+
+<img title="ESPHome DHT configuration example" src="https://github.com/esphome/home-assistant-addon/raw/main/esphome-beta/images/dht-example.png" width="500px"></img>
+
+Then just click UPLOAD and the sensor will magically appear in Home Assistant:
+
+<img title="ESPHome Home Assistant discovery" src="https://github.com/esphome/home-assistant-addon/raw/main/esphome-beta/images/temperature-humidity.png" width="600px"></img>
+
+[discord]: https://discord.gg/KhAMKrd
+[repository]: https://github.com/esphome/esphome
+[discord-shield]: https://img.shields.io/discord/429907082951524364.svg
+[github-stars-shield]: https://img.shields.io/github/stars/esphome/esphome.svg?style=social&label=Star&maxAge=2592000
+[dht22]: https://beta.esphome.io/components/sensor/dht.html
+[releases]: https://beta.esphome.io/changelog/index.html
+[logo]: https://github.com/esphome/home-assistant-addon/raw/main/esphome-beta/logo.png
+[website]: https://beta.esphome.io/