add ash_tutorial

elixir_koan.livemd

@@ -0,0 +1,59 @@
+# elixir_koan
+
+## Section
+
+```elixir
+Integer.parse("2A", 16)
+```
+
+```elixir
+Integer.parse("5 years")
+```
+
+```elixir
+Integer.parse("1.2")
+```
+
+```elixir
+Float.parse("34.5")
+```
+
+```elixir
+Float.parse("1.5 million dollars")
+```
+
+```elixir
+Float.ceil(34.25)
+```
+
+```elixir
+Float.ceil(34.25, 1)
+```
+
+```elixir
+Float.floor(99.99)
+```
+
+```elixir
+Float.floor(12.345,2)
+```
+
+```elixir
+Float.round(5.5)
+```
+
+```elixir
+Float.round(5.4)
+```
+
+```elixir
+Float.round(8.94, 1)
+```
+
+```elixir
+Float.round(-5.5674, 3)
+```
+
+```elixir
+tuple_size({:a, :b, :c})
+```