BAEL-8901 Add section in "Stream operations on Strings" article

- Added string array to map example.

java-strings/src/main/java/com/baeldung/string/JoinerSplitter.java

@@ -2,6 +2,7 @@ package com.baeldung.string;
 
 import java.util.Arrays;
 import java.util.List;
+import java.util.Map;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
@@ -32,5 +33,12 @@ public class JoinerSplitter {
 				.mapToObj(item -> (char) item)
 				.collect(Collectors.toList());
 	}
+	
+	public static Map<String, String> arrayToMap(String[] arrayOfString) {
+		return Arrays.asList(arrayOfString)
+				.stream()
+				.map(str -> str.split(":"))
+				.collect(Collectors.<String[], String, String>toMap(str -> str[0], str -> str[1]));
+	}
 		
 }