Adds some info to config files

Adds license to POM
Adds dev-url
Fixes main file location

pom.xml

@@ -4,11 +4,18 @@
          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>net.knarcraft.bookswithoutborders</groupId>
+    <groupId>net.knarcraft</groupId>
     <artifactId>books-without-borders</artifactId>
     <version>1.0-SNAPSHOT</version>
     <packaging>jar</packaging>
 
+    <licenses>
+        <license>
+            <name>GNU General Public License</name>
+            <url>https://www.gnu.org/licenses/gpl-3.0.en.html</url>
+        </license>
+    </licenses>
+
     <name>Books Without Borders</name>
 
     <description>A continuation of the original Books Without Borders</description>