add short install instructions

README.md

@@ -1,2 +1,26 @@
 # ha-component-ais_receiver
 Custom Integration to receive AIS messages
+
+## Installation via HACS
+
+First you need to have [HACS](https://hacs.xyz/) already up and running.
+
+### Add as custom repository
+
+HACS -> Integrations -> 3-dots top right -> Custom repositories
+
+- Repository: `https://github.com/mib1185/ha-component-ais_receiver.git`
+- Category: `Integration`
+
+### Download and install
+
+HACS -> Integrations -> Explore & Download Repositories
+
+- search for `AIS Receiver` and click on the entry
+
+press the Download button in the buttom right corner
+
+## Manual installation
+
+- download the source code asset from the [release page](https://github.com/mib1185/ha-component-ais_receiver/releases)
+- extract the downloaded archive and copy the `custom_components/ais_receiver` folder into the `custom_components` folder on your HA system.