Add Use dotenv In A Non-Rails Project as a ruby til

ruby/use-dotenv-in-a-non-rails-project.md

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+# Use dotenv In A Non-Rails Project
+
+Up to now I've only used [`dotenv`](https://github.com/bkeepers/dotenv) in a
+Rails context. It can just as easily be used in a plain old Ruby project.
+
+Install the non-Rails version of the gem.
+
+```bash
+$ gem install dotenv
+```
+
+Then add the following lines wherever you want `dotenv` included and loaded.
+In my case, I want it pulled in as part of my RSpec setup in
+`spec_helper.rb`.
+
+```ruby
+require 'dotenv'
+Dotenv.load
+```
+
+Your environment variables declared in `.env` are now accessible via fetches
+against the `ENV` object.
+
+```ruby
+ENV.fetch('my_env_var')
+```