Add Create Named Structs With Struct.new as a ruby til

ruby/create-named-structs-with-struct-new.md

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+# Create Named Structs With Struct.new
+
+I often see `Struct` used to create some one-off anonymous data structure
+like so:
+
+```ruby
+> person = Struct.new(:name, :age)
+=> #<Class:0x007fc6c89112e8>
+> person.new("Alice", 33)
+=> #<struct name="Alice", age=33>
+```
+
+This will often get the job done, but on its own the resulting data
+structure doesn't tell us as much as it could.
+
+We can say more with a _named_ struct:
+
+```ruby
+Struct.new("Person", :name, :age)
+=> Struct::Person
+> Struct::Person.new("Bob", 24)
+=> #<struct Struct::Person name="Bob", age=24>
+```
+
+When the first argument is a string that can be converted to a constant,
+then we'll get a named struct that is subclassed under `Struct`.
+
+We can also assign the struct initialization to a constant to do a similar
+thing:
+
+```ruby
+> Person = Struct.new(:name, :age)
+=> Person
+> Person.new("Jerry", 45)
+=> #<struct Person name="Jerry", age=45>
+```
+
+[source](https://ruby-doc.org/core-2.4.2/Struct.html#method-c-new)