chore: add maven coordinates to readme

Author: PhilippHeuer

README.md

@@ -1,6 +1,19 @@
 # *PrimeCodeGen Libraries*
 
-A collection of libraries used in generated code for the [PrimeCodeGen](https://github.com/primelib/primecodegen) project.
+[![Maven Central](https://img.shields.io/maven-central/v/io.github.primelib.primecodegenlib.java/bom)](https://central.sonatype.com/artifact/io.github.primelib.primecodegenlib.java/bom)
+
+> A collection of libraries used in generated code for the [PrimeCodeGen](https://github.com/primelib/primecodegen) project.
+
+## Installation
+
+```gradle
+// bom
+implementation(platform("io.github.primelib.primecodegenlib.java:bom:<latestVersion>"))
+
+// individual modules
+implementation("io.github.primelib.primecodegenlib.java:feign-common"))
+implementation("io.github.primelib.primecodegenlib.java:feign-resilience4j"))
+```
 
 ## License