Shopify App Ruby on Rails

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Shopify App Ruby on Rails
Im developing a new Shopify app and need some Ruby on Rails dev help.
When a Shopify Merchant installs my app, we ask the Merchant to manually add some Liquid code to their Theme files.
But my Shopify app reviewer recommended that the app automate any code injection. He says I should use ScriptTags and/or AppProxies to inject code into Liquid files. Specifically, we create new /snippets/ files and need to inject the {% include %} tag into the [login to view URL] and customer/[login to view URL] files.
I need help with writing the Ruby code to do that.
Skills:
Ruby on Rails
, JavaScript
, Git
, Ruby
, Appcelerator Titanium

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