Provide a sample showcasing SQL Server compatibility

Add a dedicated example for `MSSQLServer` compatibility mode, that
shows all DBMS-specific features in a central, user-friendly place.

h2/src/test/org/h2/samples/SQLServerSample.java

+package org.h2.samples;
+
+import org.h2.tools.DeleteDbFiles;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.ResultSet;
+import java.sql.Statement;
+
+public class SQLServerSample {
+
+    /**
+     * Called when ran from the command line.
+     *
+     * @param args ignored
+     */
+    public static void main(String... args) throws Exception {
+        Class.forName("org.h2.Driver");
+        Connection conn = DriverManager.getConnection("jdbc:h2:mem:;MODE=MSSQLServer");
+        Statement stat = conn.createStatement();
+
+        stat.execute("create table parent(id int primary key identity, name varchar(255))");
+        stat.execute("create table child(id int primary key identity, name varchar(255), parent_id int, foreign key (parent_id) references public.parent(id) )");
+        stat.execute("insert into parent values(1, 'Thomas')");
+        stat.execute("insert into child values(1, 'John', 1)");
+
+        ResultSet rs;
+        rs = stat.executeQuery("select * from parent with(nolock)");
+        while (rs.next()) {
+            System.out.println(rs.getString("name"));
+        }
+        rs = stat.executeQuery("select * from parent with(nolock, index = id)");
+        while (rs.next()) {
+            System.out.println(rs.getString("name"));
+        }
+        rs = stat.executeQuery("select * from parent with(nolock, index(id, name))");
+        while (rs.next()) {
+            System.out.println(rs.getString("name"));
+        }
+        rs = stat.executeQuery("select * from parent p with(nolock) join child ch with(nolock) on ch.parent_id = p.id");
+        while (rs.next()) {
+            System.out.println(rs.getString("parent.name") + " -> " + rs.getString("child.name"));
+        }
+        stat.close();
+        conn.close();
+    }
+
+}