feat: Added Map Reduce Design Pattern (#3184)

* MapReduce design pattern added

* Updated README.md

* added module to parent pom

map-reduce/src/main/java/com/iluwatar/Main.java

@@ -0,0 +1,55 @@
+/*
+ * This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
+ *
+ * The MIT License
+ * Copyright © 2014-2022 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package com.iluwatar;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import java.util.logging.Logger;
+
+/**
+ * The Main class serves as the entry point for executing the MapReduce program.
+ * It processes a list of text inputs, applies the MapReduce pattern, and prints the results.
+ */
+public class Main {
+  private static final Logger logger = Logger.getLogger(Main.class.getName());
+  /**
+   * The main method initiates the MapReduce process and displays the word count results.
+   *
+   * @param args Command-line arguments (not used).
+   */
+  public static void main(String[] args) {
+    List<String> inputs = Arrays.asList(
+        "Hello world hello",
+        "MapReduce is fun",
+        "Hello from the other side",
+        "Hello world"
+    );
+    List<Map.Entry<String, Integer>> result = MapReduce.mapReduce(inputs);
+    for (Map.Entry<String, Integer> entry : result) {
+      logger.info(entry.getKey() + ": " + entry.getValue());
+    }
+  }
+}