Update README with installation instructions

README.md

@@ -1,4 +1,4 @@
-# gameyfin
+# Gameyfin
 A simple game library manager.
 Name and functionality inspired by [Jellyfin](https://jellyfin.org/).
 
@@ -23,6 +23,27 @@ Also, Grifter only supports to download one file per game. Since I also have gam
 Gameyfin fixes both these limitations: It can scan your library for games and automatically match them on IGDB to load additional information.
 It can also deal with games consisting of multiple files by packing them into a .zip folder in realtime if necessary.
 
+## Installation
+
+### General
+
+Since Gameyfin loads information from IGDB, you need to register yourself there. Follow [this guide](https://api-docs.igdb.com/#account-creation).
+
+### Docker
+
+1. Download the `docker-compose.example.yml` file from this repository and rename it to just `docker-compose.yml`
+2. Edit the configuration values to your liking
+3. Run `docker-compose up -d`
+
+### Bare metal
+
+1. Make sure you have a JRE or JDK with version 18 or greater installed
+2. Download the latest .jar and `gameyfin.properties` file from the releases page
+3. Edit the config options in the `gameyfin.properties` file
+4. Use the following command to start Gameyfin: `java "-Dspring.config.name=application,database,gameyfin,secure" -jar <name of the downloaded jar file>.jar`
+   (note the quotation marks around the first argument)
+5. Open the address of your Gameyfin host in your browser, Gameyfin runs under port 8080 by default
+
 ## Screenshots
 
 ### Game library screen in light mode (top) and dark mode (bottom)