Resolve "Actuator"

Closes #11 (closed)

core/src/main/java/cz/muni/pa165/actuator/CustomInfoContributor.java

+package cz.muni.pa165.actuator;
+
+import org.springframework.boot.actuate.info.Info;
+import org.springframework.boot.actuate.info.InfoContributor;
+import org.springframework.stereotype.Component;
+
+@Component
+public class CustomInfoContributor implements InfoContributor {
+    @Override
+    public void contribute(Info.Builder builder) {
+        builder.withDetail("course", "PA165").withDetail("module", "core").build();
+    }
+}