[DotEnv][WebLink][Templating][ErrorHandler] Updated README with minimal example

Author: wouterj

src/Symfony/Component/Dotenv/README.md

@@ -4,10 +4,32 @@ Dotenv Component
 Symfony Dotenv parses `.env` files to make environment variables stored in them
 accessible via `$_SERVER` or `$_ENV`.
 
+Getting Started
+---------------
+
+```
+$ composer require symfony/dotenv
+```
+
+```php
+use Symfony\Component\Dotenv\Dotenv;
+
+$dotenv = new Dotenv();
+$dotenv->load(__DIR__.'/.env');
+
+// you can also load several files
+$dotenv->load(__DIR__.'/.env', __DIR__.'/.env.dev');
+
+// overwrites existing env variables
+$dotenv->overload(__DIR__.'/.env');
+
+// loads .env, .env.local, and .env.$APP_ENV.local or .env.$APP_ENV
+$dotenv->loadEnv(__DIR__.'/.env');
+```
+
 Resources
 ---------
 
-  * [Documentation](https://symfony.com/doc/current/components/dotenv.html)
   * [Contributing](https://symfony.com/doc/current/contributing/index.html)
   * [Report issues](https://github.com/symfony/symfony/issues) and
     [send Pull Requests](https://github.com/symfony/symfony/pulls)

src/Symfony/Component/ErrorHandler/README.md

@@ -3,6 +3,35 @@ ErrorHandler Component
 
 The ErrorHandler component provides tools to manage errors and ease debugging PHP code.
 
+Getting Started
+---------------
+
+```
+$ composer require symfony/error-handler
+```
+
+```php
+use Symfony\Component\ErrorHandler\Debug;
+use Symfony\Component\ErrorHandler\ErrorHandler;
+use Symfony\Component\ErrorHandler\DebugClassLoader;
+
+Debug::enable();
+
+// or enable only one feature
+//ErrorHandler::register();
+//DebugClassLoader::enable();
+
+$data = ErrorHandler::call(static function () use ($filename, $datetimeFormat) {
+    // if any code executed inside this anonymous function fails, a PHP exception
+    // will be thrown, even if the code uses the '@' PHP silence operator
+    $data = json_decode(file_get_contents($filename), true);
+    $data['read_at'] = date($datetimeFormat);
+    file_put_contents($filename, json_encode($data));
+
+    return $data;
+});
+```
+
 Resources
 ---------
 

src/Symfony/Component/Templating/README.md

@@ -9,10 +9,33 @@ for changes. It also provides a concrete template engine implementation using
 PHP with additional tools for escaping and separating templates into blocks and
 layouts.
 
+Getting Started
+---------------
+
+```
+$ composer require symfony/templating
+```
+
+```php
+use Symfony\Component\Templating\Loader\FilesystemLoader;
+use Symfony\Component\Templating\PhpEngine;
+use Symfony\Component\Templating\Helper\SlotsHelper;
+use Symfony\Component\Templating\TemplateNameParser;
+
+$filesystemLoader = new FilesystemLoader(__DIR__.'/views/%name%');
+
+$templating = new PhpEngine(new TemplateNameParser(), $filesystemLoader);
+$templating->set(new SlotsHelper());
+
+echo $templating->render('hello.php', ['firstname' => 'Fabien']);
+
+// hello.php
+Hello, <?= $view->escape($firstname) ?>!
+```
+
 Resources
 ---------
 
-  * [Documentation](https://symfony.com/doc/current/components/templating.html)
   * [Contributing](https://symfony.com/doc/current/contributing/index.html)
   * [Report issues](https://github.com/symfony/symfony/issues) and
     [send Pull Requests](https://github.com/symfony/symfony/pulls)

src/Symfony/Component/WebLink/README.md

@@ -8,10 +8,30 @@ This component implements the [HTML5's Links](https://www.w3.org/TR/html5/links.
 and [Resource Hints](https://www.w3.org/TR/resource-hints/) W3C's specifications.
 It can also be used with extensions defined in the [HTML5 link type extensions wiki](http://microformats.org/wiki/existing-rel-values#HTML5_link_type_extensions).
 
+Getting Started
+---------------
+
+```
+$ composer require symfony/web-link
+```
+
+```php
+use Symfony\Component\WebLink\GenericLinkProvider;
+use Symfony\Component\WebLink\HttpHeaderSerializer;
+use Symfony\Component\WebLink\Link;
+
+$linkProvider = (new GenericLinkProvider())
+    ->withLink(new Link('preload', '/bootstrap.min.css'));
+
+header('Link: '.(new HttpHeaderSerializer())->serialize($linkProvider->getLinks()));
+
+echo 'Hello';
+```
+
 Resources
 ---------
 
-  * [Documentation](https://symfony.com/doc/current/components/web_link.html)
+  * [Documentation](https://symfony.com/doc/current/web_link.html)
   * [Contributing](https://symfony.com/doc/current/contributing/index.html)
   * [Report issues](https://github.com/symfony/symfony/issues) and
     [send Pull Requests](https://github.com/symfony/symfony/pulls)