feat: adds refreshed WDL brand guidelines and assets for 2025

Author: claymcleod

.github/assets/readme-header.svg

@@ -1,3 +1,21 @@
-# OpenWDL Media
+<div style="align: center">
+  <img src=".github/assets/readme-header.svg">
+</div>
 
-This repository contains media materials for the OpenWDL community in various different formats. 
+<br />
+
+This repository holds the brand guidelines and a assets for the Workflow
+Description Language and OpenWDL.
+
+- Please refer to the [brand guidelines] on directions for how to use the logo
+  and other brand assets.
+- You will find individual assets underneath the `assets/` directory within this repository.
+
+## License
+
+The WDL specification is made available to you under the permissive [BSD
+3-Clause License](./LICENSE).
+
+© 2019-Present The OpenWDL Developers
+
+[brand guidelines]: ./Guidelines.pdf