docs(http): add simple example

packages/wyatt_http_client/example/example.dart

@@ -0,0 +1,78 @@
+// Copyright (C) 2023 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'package:wyatt_http_client/wyatt_http_client.dart';
+
+Future<void> testSimpleGet() async {
+  print('testSimpleGet');
+  final pipeline = Pipeline()
+    ..addMiddleware(const BodyToJsonMiddleware())
+    ..addMiddleware(const SimpleLoggerMiddleware());
+
+  final client = MiddlewareClient(pipeline: pipeline);
+
+  final response = await client
+      .get(Uri.parse('https://jsonplaceholder.typicode.com/todos/1'));
+  print(response.body);
+}
+
+Future<void> testUriPrefix() async {
+  print('testUriPrefix');
+  final pipeline = Pipeline()
+    ..addMiddleware(
+      const UriPrefixMiddleware(
+        protocol: Protocols.https,
+        authority: 'jsonplaceholder.typicode.com',
+      ),
+    )
+    ..addMiddleware(const BodyToJsonMiddleware())
+    ..addMiddleware(const SimpleLoggerMiddleware());
+
+  final client = MiddlewareClient(pipeline: pipeline);
+
+  final response = await client.get(Uri.parse('/todos/1'));
+  print(response.body);
+}
+
+Future<void> testBasicAuth() async {
+  print('testBasicAuth');
+  final pipeline = Pipeline()
+    ..addMiddleware(
+      const BasicAuthMiddleware(
+        username: 'guest',
+        password: 'guest',
+      ),
+    )
+    ..addMiddleware(const BodyToJsonMiddleware())
+    ..addMiddleware(const SimpleLoggerMiddleware());
+
+  final client = MiddlewareClient(pipeline: pipeline);
+
+  final response =
+      await client.get(Uri.parse('https://jigsaw.w3.org/HTTP/Basic/'));
+
+  if (HttpStatus.from(response.statusCode).isSuccess()) {
+    print("🎉 You're in!");
+  } else {
+    print("⭕️ Nope, you're not in.");
+  }
+}
+
+void main(List<String> args) {
+  testSimpleGet();
+  testUriPrefix();
+  testBasicAuth();
+}