Optimized documentation

application/symfony/README.md

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+## backend application
+
+## conventions
+
+### coding
+
+#### symfony
+The application MUST use Symfony 4. 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*.