Add widget examples


cc:

@kvablack

README.md

@@ -13,6 +13,13 @@ inference:
     num_inference_steps: 50
     guidance_scale: 5.0
     eta: 1.0
+widget:
+- text: "lion"
+  example_title: lion
+- text: "butterfly"
+  example_title: butterfly
+- text: "dolphin"
+  example_title: dolphin
 ---
 
 # ddpo-aesthetic