Update README with light and dark mode logos

Added images for light and dark mode logos in README.

Author: sven1103

README.md

@@ -1,6 +1,10 @@
 <div align="center">
 
-# Compass
+<p align="center">
+  <img src="./assets/logo/compass-logo-full-light.svg#gh-light-mode-only" alt="Compass logo" width="200">
+  <img src="./assets/logo/compass-logo-full-dark.svg#gh-dark-mode-only" alt="Compass logo" width="200">
+</p>
+
 **Java library for FAIR Signposting validation of RFC 8288 Web Links.**
 
 [![Build Maven Package](https://github.com/qbicsoftware/compass/actions/workflows/build_package.yml/badge.svg)](https://github.com/qbicsoftware/compass/actions/workflows/build_package.yml)