Add base core plugin

ic_plugin_core/pom.xml

@@ -3,13 +3,13 @@
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
-  <groupId>nl.interestingcorner</groupId>
+  <groupId>nl.interestingcorner.core</groupId>
   <artifactId>ic_plugin_core</artifactId>
   <version>1.0-SNAPSHOT</version>
 
   <name>ic_plugin_core</name>
   <!-- FIXME change it to the project's website -->
-  <url>http://www.example.com</url>
+  <url>https://interesting-corner.nl</url>
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

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

@@ -1,4 +1,4 @@
-package nl.interestingcorner;
+package nl.interestingcorner.core;
 
 /**
  * Hello world!

ic_plugin_core/src/main/resources/plugin.yml

@@ -0,0 +1,4 @@
+main: nl.interestingcorner.core.App
+name: IC-core
+version: 0.1
+api-version: 1.21