Update readme

Author: shakiba

README.md

@@ -4,4 +4,14 @@ Piqnt Runtime is a collection of middlewares that power Piqnt.com, and Planck.js
 
 You can use it to run your code, or mix-and-match middlewares to create your own runtime environment.
 
-For more information about middlewares, check out the [Polymatic](https://github.com/piqnt/polymatic) project.
+### Middleware Architecture
+
+To learn more about middlewares, check out the [Polymatic](https://github.com/piqnt/polymatic) project.
+
+### Usage Examples
+
+To learn how you can use it in your project, see following examples:
+
+[Testbed](https://github.com/piqnt/runtime/blob/main/packages/planck-testbed/src/testbed/TestbedMain.ts) - Includes a preset of middlewares for running Planck.js physics engine examples.  
+
+Pinball game ([Play](https://piqnt.github.io/polymatic-example-pinball/), [Source](https://github.com/piqnt/polymatic-example-pinball/)) - Uses a subset of Testbed middlewares, and adds custom middlewares for loading svg table design, loading data into physics, user input handing, etc.