Update README.md

Model Stable Diffusion XL Base 1.0 optimized using Microsoft Olive (https://github.com/microsoft/Olive)

README.md

@@ -1,3 +1,8 @@
 ---
 license: openrail++
----
+language:
+- en
+pipeline_tag: text-to-image
+tags:
+- art
+---