Add Create An Array of Stringed Numbers as a ruby til.

ruby/create-an-array-of-stringed-numbers.md

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+# Create an Array of Stringed Numbers
+
+To create an array of numbers between `1` and `5`, I can do something like
+the following:
+
+```ruby
+(1..5).to_a
+> [1,2,3,4,5]
+```
+
+However, what if I want an array of `"1"` to `"5"`? That is, what if I want
+an array of consecutive numbers as strings?
+
+I can just reuse the above and map them to strings like so:
+
+```ruby
+(1..5).to_a.map(&:to_s)
+> ['1','2','3','4','5']
+```
+
+Though, that seems more verbose than necessary. Ruby actually allows you to
+do ranges of characters. Which means that I can modify my original approach
+to look something like this:
+
+```ruby
+('1'..'5').to_a
+> ['1','2','3','4','5']
+```