Add mage v3 plugin (deployment)

docs/en/plugins/mage3.md

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+Plugin Mage v3
+==============
+
+Triggers a deployment of the project to run via [Mage v3](https://github.com/andres-montanez/Magallanes)
+
+Configuration
+-------------
+
+### Options
+
+* **env** [required, string] - The environment name
+
+### Examples
+
+```yaml
+deploy:
+    mage3:
+        env: production
+```
+
+### Options for config.yml
+
+* **bin** [optional, string] - The mage executable path
+* **log_dir** [optional, string] - The mage logs path
+
+### Examples
+
+```yaml
+mage:
+    bin: /usr/local/bin/mage
+    log_dir: ./var/log
+```