Add Round Floats To Integers as an elixir til

elixir/round-floats-to-integers.md

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+# Round Floats To Integers
+
+The
+[`Float.round/2`](http://elixir-lang.org/docs/stable/elixir/Float.html#round/2)
+function allows you to round floating point numbers. The result is another
+floating point number.
+
+```elixir
+> Float.round(1.5)
+2.0
+> Float.round(1.3)
+1.0
+```
+
+If, instead, you always want an integer as the result of rounding, you can
+use `Kernel`'s version of a rounding function:
+
+```elixir
+> Kernel.round(1.5)
+2
+> Kernel.round(1.3)
+1
+```
+
+The
+[`Kernel.round/1`](http://elixir-lang.org/docs/stable/elixir/Kernel.html#round/1)
+function accepts both integers and floats, and always returns an integer.
+Additionally, it can be used in guard tests.