build the README.md files for the HA Add-ons

ha_addons/templates/README.jinja

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+# Home Assistant Add-on: {{name}}
+
+{{readme_descr}}
+
+## Features
+
+- Supports TSUN GEN3 PLUS inverters: TSOL-MS2000, MS1800 and MS1600
+- Supports TSUN GEN3 PLUS batteries: TSOL-DC1000 (from version 0.13)
+- Supports TSUN GEN3 inverters: TSOL-MS3000, MS800, MS700, MS600, MS400, MS350 and MS300
+- `Home-Assistant` auto-discovery support
+- `MODBUS` support via MQTT topics
+- `AT-Command` support via MQTT topics (GEN3PLUS only)
+- Faster DataUp interval sends measurement data to the MQTT broker every minute
+- Self-sufficient island operation without internet
+- Security-Features:
+  - control access via `AT-commands`
+
+## About
+
+This Add-on and the TSUN Proxy is not related to the company TSUN. It is a private initiative that aims to connect TSUN inverters and storage systems with an MQTT broker. There is no support and no warranty from TSUN.
+{{readme_links}}