Fill pom.xml for core plugin

ic_plugin_core/pom.xml

@@ -15,7 +15,12 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.release>17</maven.compiler.release>
     </properties>
-
+    <repositories>
+        <repository>
+            <id>spigot-repo</id>
+            <url>https://hub.spigotmc.org/nexus/content/repositories/snapshots/</url>
+        </repository>
+    </repositories>
     <dependencyManagement>
         <dependencies>
             <dependency>
@@ -40,9 +45,35 @@
             <artifactId>junit-jupiter-params</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>com.google.errorprone</groupId>
+            <artifactId>error_prone_annotations</artifactId>
+            <version>2.28.0</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.spigotmc</groupId>
+            <artifactId>spigot-api</artifactId>
+            <version>1.21.8-R0.1-SNAPSHOT</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.xerial</groupId>
+            <artifactId>sqlite-jdbc</artifactId>
+            <version>3.50.3.0</version>
+        </dependency>
     </dependencies>
 
     <build>
+        <sourceDirectory>${project.basedir}/src/main/java</sourceDirectory>
+        <resources>
+            <resource>
+                <directory>${project.basedir}/src/main/resources</directory>
+                <includes>
+                    <include>plugin.yml</include>
+                </includes>
+            </resource>
+        </resources>
         <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
             <plugins>
                 <!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
@@ -66,6 +97,12 @@
                 <plugin>
                     <artifactId>maven-jar-plugin</artifactId>
                     <version>3.4.2</version>
+                    <configuration>
+                        <systemPropertyVariables>
+                            <db.username>${db.username}</db.username>
+                            <db.password>${db.password}</db.password>
+                        </systemPropertyVariables>
+                    </configuration>
                 </plugin>
                 <plugin>
                     <artifactId>maven-install-plugin</artifactId>

ic_plugin_core/src/main/java/nl/interestingcorner/core/App.java

@@ -1,10 +1,17 @@
 package nl.interestingcorner.core;
 
+import org.bukkit.plugin.java.JavaPlugin;
+
 /**
  * Hello world!
  */
 public class App {
-    public static void main(String[] args) {
+    @Override
-        System.out.println("Hello World!");
+    public void onEnable() {
+        getLogger().info("Hello, SpigotMC!");
+    }
+    @Override
+    public void onDisable() {
+        getLogger().info("See you again, SpigotMC!");
     }
 }