Add module-info and update to Java 8 as a minimum

Project now requires Java 8

src/changes/changes.xml

@@ -9,6 +9,9 @@
 
     <!-- types are add, fix, remove, update -->
     <release version="1.0" date="SNAPSHOT" description="v1.0">
+      <action dev="jodastephen" type="add">
+        Add module-info for Java 9.
+      </action>
       <action dev="jodastephen" type="add">
         Update and redesign build to support Java 9.
         Switch to require Java 8.

src/main/java/module-info.java

@@ -0,0 +1,28 @@
+/*
+ *  Copyright 2014-present Stephen Colebourne
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+/**
+ * Joda-Collect provides a {@code Grid} data structure based on the {@code Table} data structure in Guava.
+ */
+module org.joda.collect {
+
+    // dependency on Guava - transient as Guava types are in Joda-Convert API
+    requires transitive com.google.common;
+
+    // export all packages
+    exports org.joda.collect.grid;
+
+}