Update the content of the README file

Author: Nilo Soares

README.md

@@ -1,2 +1,30 @@
-# cpf-validator
+# CPF Symfony Validator
+
 A custom Symfony Validator that validates CPF.
+
+## Requirements
+
+- PHP >= 7.4
+
+## Installation
+
+    composer require cancio-labs/cpf-symfony-validator
+
+## How to use it
+
+Add the CpfConstraint in your entity...
+
+    use CancioLabs\Validator\Cpf\CpfConstraint;
+
+    #[CpfConstraint]
+    private ?Cpf $cpf = null;
+
+or add it to a constraint list:
+
+    use CancioLabs\Validator\Cpf\CpfConstraint;    
+
+    $formBuilder->add('cpf', TextType::class, [
+        'constraints' => [
+            new CpfConstraint(),
+        ],
+    ]);