Add echo server and client example

examples/echo_server/README.md

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+# Echo Server
+
+A simple echo server example using `lightbug_http` for the server and `floki` for the client. The server listens for incoming HTTP requests and responds with the same body and content type.
+
+To run the server, execute the following command in the terminal:
+
+```bash
+pixi run server
+```
+
+In a separate terminal, you can run the client to send a request to the server:
+
+```bash
+pixi run client
+```

examples/echo_server/client.mojo

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+import floki
+
+
+fn main() raises:
+    var response = floki.post(
+        "localhost:8080",
+        headers={"Content-Type": "text/plain"},
+        data="Hello, Echo Server!".as_bytes()
+    )
+    print(response.body.as_string_slice())
+
+    response = floki.post(
+        "localhost:8080",
+        headers={"Content-Type": "application/json"},
+        data={"message": "Hello, Echo Server!"}
+    )
+    print(response.body.as_json())