add PasswordGenerator class

src/main/java/PasswordGenerator.java

@@ -0,0 +1,5 @@
+public class PasswordGenerator {
+    public String generateRandomPassword() {
+        return "";
+    }
+}

src/test/java/PasswordGeneratorTest.java

@@ -0,0 +1,19 @@
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class PasswordGeneratorTest {
+
+    static PasswordGenerator passwordGenerator;
+
+    @BeforeAll
+    static void init() {
+        passwordGenerator = new PasswordGenerator();
+    }
+
+    @Test
+    void generateRandomPassword() {
+        assertSame("", passwordGenerator.generateRandomPassword());
+    }
+}