Add initial ProgressView docs

- Relates #995

spring-shell-docs/src/test/java/org/springframework/shell/docs/ProgressViewSnippets.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.shell.docs;
+
+import org.springframework.shell.component.view.control.ProgressView;
+import org.springframework.shell.component.view.control.ProgressView.ProgressViewItem;
+import org.springframework.shell.geom.HorizontalAlign;
+
+public class ProgressViewSnippets {
+
+	class Dump1 {
+
+		void dump1() {
+			// tag::default[]
+			ProgressView view = new ProgressView();
+			view.start();
+			// end::default[]
+		}
+
+		void dump2() {
+			// tag::allmixedalignandsize[]
+			ProgressView view = new ProgressView(
+				ProgressViewItem.ofText(10, HorizontalAlign.LEFT),
+				ProgressViewItem.ofSpinner(3, HorizontalAlign.LEFT),
+				ProgressViewItem.ofPercent(0, HorizontalAlign.RIGHT));
+			view.start();
+			// end::allmixedalignandsize[]
+		}
+
+	}
+
+}