Add README.md

README.md

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+# iugu-laravel
+Interface de comunicação com a API do Iugu para Laravel
+
+# exemplo de uso até o momento:
+
+```
+$user = User::find(1);
+$invoice = new InvoiceBuilder();
+$result = $invoice
+    ->setEmail($user->email)
+    ->setDueDate(Carbon::now()->addDays(3)->format("Y-m-d"))
+    ->setPayer(
+        name: $user->name,
+        documentNumber: $user->cpf
+    )
+    ->setItem(
+        description: 'Fatura de teste',
+        quantity: 2,
+        priceCents: 100
+    )
+    ->setLocalPersistenceConfig(
+        model: new Invoice(),
+        map: [
+            'gatewayColumn' => 'service',
+            'id' => 'service_id',
+            'total_cents' => 'price'
+        ],
+        data: [
+            'user_id' => $user->id,
+        ]
+    )
+    ->create();
+```