added link to 30 days trial on platform.sh

Author: OskarStark

deployment/platformsh.rst

@@ -16,7 +16,7 @@ In this guide, it is assumed your codebase is already versioned with Git.
 Get a Project on Platform.sh
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-You need to subscribe to a `Platform.sh project`_. Choose the development plan
+You need to subscribe to a `Platform.sh project`_ (or use a free `30 days trial`_). Choose the development plan
 and go through the checkout process. Once your project is ready, give it a name
 and choose: **Import an existing site**.
 
@@ -189,6 +189,7 @@ soon be able to see it in your browser.
 .. _`Platform.sh`: https://platform.sh
 .. _`Platform.sh documentation`: https://docs.platform.sh/frameworks/symfony.html
 .. _`Platform.sh project`: https://accounts.platform.sh/platform/buy-now
+.. _`30 days trial`: https://accounts.platform.sh/platform/trial/general/setup
 .. _`Platform.sh configuration files`: https://docs.platform.sh/configuration/services.html
 .. _`GitHub`: https://github.com/platformsh/platformsh-examples
 .. _`available services`: https://docs.platform.sh/reference/configuration-files/#configure-services