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+The key words “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”,
+“SHOULD NOT”, “RECOMMENDED”, “MAY”, and “OPTIONAL” in this document are to be
+interpreted as described in [RFC 2119](https://tools.ietf.org/html/rfc2119).
+
+# standards
+
+## coding standards
+
+### php
+PHP code MUST follow the [PSR-4](https://www.php-fig.org/psr/psr-4/) standard.
+
+### twig
+Twig templates MUST follow the [Symfony Template best practices](https://symfony.com/doc/current/best_practices/templates.html).
+
+### naming
+
+#### interfaces
+
+A Interfaces MUST be named *ClassnameInterface*.
+
+It SHOULD be based in the directory of the class.
+
+#### abstract classes
+
+A abstract class MUST be named *AbstractClassname*.
+
+It SHOULD be based in the directory of the classes which inherit from it.
+
+#### entities
+
+##### source
+
+A source MUST be named *SourcenameSource*.