Add a sample curl and JSON response to the API.

examples/sample-response.json

@@ -0,0 +1,15 @@
+{
+  "method": "PUT",
+  "path": "/api/testing",
+  "host": "localhost:8180",
+  "headers": {
+    "accept": "*/*",
+    "content-length": "18",
+    "content-type": "application/json",
+    "host": "localhost:8180",
+    "user-agent": "curl/7.68.0"
+  },
+  "body": {
+    "hello": "world"
+  }
+}

src/main.rs

@@ -49,11 +49,26 @@ struct EchoResponse {
 ///
 /// Captures the request and responds with a JSON response of the elements of the request.
 ///
-/// TODO: Add a example of the JSON output of the response.
-///
 /// ## Arguments
 /// * `method` - The HTTP [`Method`] used for the request. i.e. `GET`, `POST`, `PATCH`, etc.
 /// TODO: Document the rest of the arguments
+///
+/// ## Example
+///
+/// Sending a request using `curl`:
+///
+/// ```console
+/// $ curl -s -X PUT -D '{"hello": "world"}' -H 'Content-Type: application/json' \
+///     http://localhost:8080/api/testing | jq .
+/// ```
+///
+/// Results in a JSON response:
+///
+/// ```json
+#[doc = include_str!("../examples/sample-response.json")]
+/// ```
+///
+
 async fn echo_request(
     method: Method,
     original_uri: OriginalUri,