Added invoices

Author: LasseRafn

src/Builders/InvoiceBuilder.php

@@ -0,0 +1,9 @@
+<?php namespace LasseRafn\Economic\Builders;
+
+use LasseRafn\Economic\Models\Invoice;
+
+class InvoiceBuilder extends Builder
+{
+	protected $entity = 'invoices';
+	protected $model = Invoice::class;
+}

src/Models/Invoice.php

@@ -0,0 +1,59 @@
+<?php namespace LasseRafn\Economic\Models;
+
+use LasseRafn\Economic\Utils\Model;
+
+class Invoice extends Model
+{
+	protected $entity     = 'invoices';
+	protected $primaryKey = 'draftInvoiceNumber';
+	protected $fillable   = [
+		'draftInvoiceNumber',
+		'self',
+		'pdf',
+		'dueDate',
+		'date',
+		'currency',
+		'customer',
+		'layout',
+		'paymentTerms',
+		'recipient',
+		'lines',
+	];
+
+	public $draftInvoiceNumber;
+	public $self;
+	public $pdf;
+	public $name;
+	public $dueDate;
+	public $date;
+	public $currency;
+	public $recipient;
+
+	/** @var Customer */
+	public $customer;
+
+	/** @var Layout */
+	public $layout;
+
+	/** @var PaymentTerm */
+	public $paymentTerms;
+
+	/** @var array */
+	public $lines;
+
+	/**
+	 * @param string $description
+	 * @param int    $quantity
+	 * @param        $product
+	 * @param        $unit
+	 */
+	public function addLine( $description = '', $quantity = 1, $product, $unit )
+	{
+		$this->lines[] = [
+			'description' => $description,
+			'quantity'    => $quantity,
+			'product'     => $product,
+			'unit'        => $unit
+		];
+	}
+}