Added class and os alternates

.oh-my-zsh/plugins/symfony/README.md

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+# Symfony
+
+This plugin provides completion for [Symfony](https://symfony.com/).
+
+To use it add symfony to the plugins array in your zshrc file.
+
+```bash
+plugins=(... symfony)
+```

.oh-my-zsh/plugins/symfony/symfony.plugin.zsh

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+# symfony basic command completion
+
+_symfony_get_command_list () {
+    php symfony | sed "1,/Available tasks/d" | awk 'BEGIN { cat=null; } /^[A-Za-z]+$/ { cat = $1; } /^  :[a-z]+/ { print cat $1; }'
+}
+
+_symfony () {
+  if [ -f symfony ]; then
+    compadd `_symfony_get_command_list`
+  fi
+}
+
+compdef _symfony symfony