Add demo icon 📺 (#227)

Author: tungbq

README.md

@@ -130,7 +130,7 @@ Explore the comprehensive guide below to gain insight into the detailed utilizat
 - For detailed instructions on using specific tools, refer to: [**DevOps toolkit specific tool user guide**](./docs/usage/README.md)
 - For instructions on common run modes, visit [**DevOps toolkit common run mode**](./docs/usage/run_mode.md)
 
-## Demo
+## Demo 📺
 
 - Checkout the Demo code and instruction [here](./demo/).
 

demo/README.md

@@ -1,4 +1,4 @@
-# DevOps Toolkit demo
+# DevOps Toolkit demo 📺
 
 ## Quick demo