add logo to readme

README.md

@@ -1,4 +1,13 @@
-# daggre
+<p float="left">
+<a href="https://github.com/timkpaine/daggre#gh-light-mode-only">
+  <img src="https://github.com/timkpaine/daggre/raw/main/docs/img/logo-light.png?raw=true#gh-light-mode-only" alt="daggre" width="100" />
+</a>
+<a href="https://github.com/timkpaine/daggre#gh-dark-mode-only">
+  <img src="https://github.com/timkpaine/daggre/raw/main/docs/img/logo-dark.png?raw=true#gh-dark-mode-only" alt="daggre" width="100" />
+</a>
+<h1>daggre</h1>
+</p>
+
 A convenience layer on top of `dagre-d3` (`dagre-d3-es`), for use in [ipydagred3](https://github.com/timkpaine/ipydaggre). Built on [transports](https://github.com/timkpaine/transports).
 
 [![Build Status](https://github.com/timkpaine/daggre/actions/workflows/build.yml/badge.svg?branch=main)](https://github.com/timkpaine/daggre/actions?query=workflow%3A%22Build+Status%22)