feat: add Cucumber step definitions for example scenario

Author: otaviojava

src/test/java/org/soujava/demos/mongodb/StepDefinitions.java

@@ -0,0 +1,21 @@
+package org.soujava.demos.mongodb;
+
+import io.cucumber.java.en.Given;
+import io.cucumber.java.en.Then;
+import io.cucumber.java.en.When;
+
+public class StepDefinitions {
+
+    @Given("an example scenario")
+    public void anExampleScenario() {
+    }
+
+    @When("all step definitions are implemented")
+    public void allStepDefinitionsAreImplemented() {
+    }
+
+    @Then("the scenario passes")
+    public void theScenarioPasses() {
+    }
+
+}