chore: add agent skill demo

Author: luispadron

.github/assets/drift_skill_demo.png

@@ -174,6 +174,10 @@ mkdir -p ~/.claude/skills/drift && gh release download --repo block/drift --patt
 mkdir -p ~/.agents/skills/drift && gh release download --repo block/drift --pattern 'skill.tar.gz' --output - | tar -xz -C ~/.agents/skills/drift
 ```
 
+**Demo**
+
+![Drift skill demo](.github/assets/drift_skill_demo.png)
+
 ## License
 
 [Apache License 2.0](LICENSE)