Add graphcli stub

- I'm going to use graphcli to explore the GraphDB Java interface
  as the tutorials use Java.

- I'll look into Scala later (ideally tomorrow).

graphdb/graphcli/.gitignore

+target
+.idea
+graphcli.iml

graphdb/graphcli/pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         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>me.schaertl</groupId>
+    <artifactId>graphcli</artifactId>
+    <version>indev</version>
+
+
+</project>
\ No newline at end of file

graphdb/graphcli/src/main/java/me/schaertl/graphcli/Main.java

+package me.schaertl.graphcli;
+
+public class Main {
+    public static void main(String[] args) {
+        System.out.println("Hello, World!");
+    }
+}