Add Generate Ruby Version And Gemset Files With RVM as a ruby til

ruby/generate-ruby-version-and-gemset-files-with-rvm.md

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+# Generate Ruby Version And Gemset Files With RVM
+
+[RVM](https://rvm.io), the ruby version manager, is a fairly flexible tool
+that supports a number of workflows. The `rvm` utility can be used to
+generate both a `.ruby-version` file and a `.ruby-gemset` file for a given
+project.
+
+```bash
+$ rvm --ruby-version use 2.5.3@my_project
+```
+
+This will generate a `.ruby-version` file in your current project directory
+that points RVM to the `2.5.3` version of Ruby. It will also create a
+`.ruby-gemset` file that RVM will use for managing this project's gemset.