Update README.md

libraries-testing/src/test/java/com/baeldung/hamcrest/IsPositiveInteger.java

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+package com.baeldung.hamcrest;
+
+import org.hamcrest.Description;
+import org.hamcrest.Factory;
+import org.hamcrest.Matcher;
+import org.hamcrest.TypeSafeMatcher;
+
+public class IsPositiveInteger extends TypeSafeMatcher<Integer> {
+
+	public void describeTo(Description description) {
+		description.appendText("a positive integer");
+	}
+
+	@Factory
+	public static Matcher<Integer> isAPositiveInteger() {
+		return new IsPositiveInteger();
+	}
+
+	@Override
+	protected boolean matchesSafely(Integer integer) {
+		return integer > 0;
+	}
+
+}