minor #13 Added the initial documentation (javiereguiluz)

This PR was squashed before being merged into the 1.0-dev branch (closes #13).

Discussion
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Added the initial documentation

Commits
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6c23d78 Added the initial documentation

Author: fabpot

README.md

@@ -3,5 +3,11 @@ SymfonyMakerBundle
 
 Symfony Maker helps you creating empty commands, controllers, form classes,
 tests and more so you can forget about the required boilerplate code. This
-bundle replaces [SensioGeneratorBundle](https://github.com/sensiolabs/SensioGeneratorBundle)
-in modern Symfony applications.
+bundle is an alternative to [SensioGeneratorBundle][1] for modern Symfony
+applications and requires using Symfony 3.4 or newer and [Symfony Flex][2].
+
+[Read the docs][3]
+
+[1]: https://github.com/sensiolabs/SensioGeneratorBundle
+[2]: https://symfony.com/doc/current/setup/flex.html
+[3]: Resources/doc/index.rst

src/Resources/doc/index.rst

@@ -0,0 +1,121 @@
+SymfonyMakerBundle
+==================
+
+Symfony Maker helps you creating empty commands, controllers, form classes,
+tests and more so you can forget about the required boilerplate code. This
+bundle is an alternative to `SensioGeneratorBundle`_ for modern Symfony
+applications and requires using Symfony 3.4 or newer and `Symfony Flex`_.
+
+Installation
+------------
+
+Run this command to install and enable this bundle in your application:
+
+.. code-block:: terminal
+
+    $ composer require maker
+
+Usage
+-----
+
+This bundle provides several commands under the ``maker:`` namespace. List them
+all executing this command:
+
+.. code-block:: terminal
+
+    $ php bin/console list make
+
+     make:command            Creates a new console command class
+     make:controller         Creates a new controller class
+     make:entity             Creates a new Doctrine entity class
+
+     [...]
+
+     make:validator          Creates a new validator and constraint class
+     make:voter              Creates a new security voter class
+
+The names of the commands are self-explanatory, but some of them include
+optional arguments and options. Check them out with the ``--help`` option:
+
+.. code-block:: terminal
+
+    $ php bin/console make:controller --help
+
+Creating your Own Makers
+------------------------
+
+In case your applications need to generate custom boilerplate code, you can
+create your own ``make:...`` command reusing the tools provided by this bundle.
+Imagine that you need to create a ``make:report`` command. First, create an
+empty command:
+
+.. code-block:: terminal
+
+    $ cd your-project/
+    $ php bin/console make:command 'make:report'
+
+Then, change the generated command to extend from
+:class:`Symfony\\Bundle\\MakerBundle\\Command\\AbstractCommand`, which is the
+base command used by all ``make:`` commands:
+
+.. code-block:: diff
+
+    // ...
+    -use Symfony\Component\Console\Command\Command;
+    +use Symfony\Bundle\MakerBundle\Command\AbstractCommand;
+
+    -class MakeReportCommand extends Command
+    +class MakeReportCommand extends AbstractCommand
+    {
+        protected static $defaultName = 'make:report';
+
+        // ...
+    }
+
+Finally, implement the methods required by the ``AbstractCommand`` class::
+
+    // ...
+    use Symfony\Bundle\MakerBundle\Command\AbstractCommand;
+    use Symfony\Bundle\MakerBundle\ConsoleStyle;
+    use Symfony\Bundle\MakerBundle\DependencyBuilder;
+
+    class MakeReportCommand extends AbstractCommand
+    {
+        protected static $defaultName = 'make:report';
+
+        // ...
+
+        // Returns pairs of name-value parameters used to fill in the
+        // skeleton files of the generated code and the success/error messages
+        protected function getParameters(): array
+        {
+            return [
+                'filename' => sprintf('report-%s.txt', date('YmdHis')),
+            ];
+        }
+
+        // Returns pairs of skeleton files (absolute paths) and their corresponding
+        // generated files (with paths relative to the app)
+        protected function getFiles(array $params): array
+        {
+            return [
+                __DIR__.'/../Resources/skeleton/report.txt' => 'reports/'.$params['filename'];
+            ];
+        }
+
+        // Optionally, display some message after the generation of code
+        protected function writeNextStepsMessage(array $params, ConsoleStyle $io)
+        {
+            $io->text(sprintf('A new report was generated in the %s file.', $params['filename']));
+        }
+
+        // Optionally, define which classes must exist in the application to make
+        // this command work (useful to ensure that needed dependencies are installed)
+        protected function configureDependencies(DependencyBuilder $dependencies)
+        {
+            $dependencies->addClassDependency(PdfGenerator::class, ['acme-pdf-generator'], true);
+        }
+    }
+
+.. _`SensioGeneratorBundle`: https://github.com/sensiolabs/SensioGeneratorBundle
+.. _`Symfony Flex`: https://symfony.com/doc/current/setup/flex.html