feat: Add py-libp2p to rust-libp2p interoperability tests

tests/interop/rust_libp2p/rust_node/README.md

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+## Description
+
+The ping example showcases how to create a network of nodes that establish connections, negotiate the ping protocol, and ping each other.
+
+## Usage
+
+To run the example, follow these steps:
+
+1. In a first terminal window, run the following command:
+
+   ```sh
+   cargo run
+   ```
+
+   This command starts a node and prints the `PeerId` and the listening addresses, such as `Listening on "/ip4/0.0.0.0/tcp/24915"`.
+
+2. In a second terminal window, start a new instance of the example with the following command:
+
+   ```sh
+   cargo run -- /ip4/127.0.0.1/tcp/24915
+   ```
+
+   Replace `/ip4/127.0.0.1/tcp/24915` with the listen address of the first node obtained from the first terminal window.
+
+3. The two nodes will establish a connection, negotiate the ping protocol, and begin pinging each other.
+
+## Conclusion
+
+The ping example demonstrates the basic usage of **libp2p** to create a simple p2p network and implement a ping protocol.
+By running multiple nodes and observing the ping behavior, users can gain insights into how **libp2p** facilitates communication and interaction between peers.