Add support for SLF4J logging in :api

editor/build.gradle

@@ -44,10 +44,10 @@ dependencies {
     implementation "org.codehaus.janino:janino:${janinoVersion}"
     implementation "org.codehaus.janino:commons-compiler:${janinoVersion}"
 
-
     // Spring
     implementation 'org.springframework.boot:spring-boot-starter'
     implementation 'org.springframework.boot:spring-boot-starter-freemarker'
+    implementation "org.slf4j:jul-to-slf4j:${slf4jVersion}"
 }
 
 task provideGameEngine(type: Copy) {

editor/src/main/resources/java_templates/game_runner.ftl

@@ -1,13 +1,18 @@
 package ${package};
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import com.bartlomiejpluta.base.api.game.context.Context;
 import com.bartlomiejpluta.base.api.game.screen.Screen;
 import com.bartlomiejpluta.base.api.game.runner.GameRunner;
 
 public class ${className} implements GameRunner {
+   private static final Logger log = LoggerFactory.getLogger(${className}.class);
 
    @Override
    public void init(Context context) {
+      log.info("The game runner is not implemented yet...");
       throw new RuntimeException("Not implemented yet");
    }