added isBlank method, along with junit test and readme update

src/main/java/strman/Strman.java

@@ -38,6 +38,9 @@ import static java.util.function.Function.identity;
 import static java.util.stream.Collectors.counting;
 import static java.util.stream.Collectors.groupingBy;
 import static java.util.stream.Collectors.joining;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static strman.Strman.isBlank;
 
 /**
  * A String manipulation library without any dependencies
@@ -1305,6 +1308,16 @@ public abstract class Strman {
                 .mapToObj(c -> (char) c)
                 .collect(groupingBy(identity(), counting()));
     }
+    
+    /**
+     * Checks if string is empty.  This is a null safe check and will return true when string is null.
+     *
+     * @param input The input string
+     * @return true if string is null or empty
+     */
+	public static boolean isBlank(String input) {
+		return input == null || input.isEmpty();
+	}
 
     private static void validate(String value, Predicate<String> predicate, final Supplier<String> supplier) {
         if (predicate.test(value)) {
@@ -1325,5 +1338,6 @@ public abstract class Strman {
         }
         return countSubstr(value.substring(offset), subStr, allowOverlapping, ++count);
     }
+    
 }