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Added basic README to explain usage
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|+This gem is exceptionally simple but also very handy. Let's say you are working in ActiveRecord and you have loaded a collection of objects in a query. You now want to preload associations for these already retrieved objects. This allows you to do that.|
|+The usage of this is very straightforward:|
|+ @users = User.all|
|+This will eager load all posts for each user even after the initial find query has taken place. You can also use this to preload associations for a member as well:|
|+ @user = User.first|
|+Why not just do?|
|+Good question. In most cases this is the better option. This code is for when that approach is not available.|