Generic custom types

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diff --git a/src/content/chapter3_data_types/lesson05_generic_custom_types/code.gleam b/src/content/chapter3_data_types/lesson05_generic_custom_types/code.gleam
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@@ -0,0 +1,10 @@
+pub type Option(inner) {
+  Some(inner)
+  None
+}
+
+// An option of string
+pub const name: Option(String) = Some("Annah")
+
+// An option of int
+pub const level: Option(Int) = Some(10)
diff --git a/src/content/chapter3_data_types/lesson05_generic_custom_types/en.html b/src/content/chapter3_data_types/lesson05_generic_custom_types/en.html
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+<p>
+  Like functions, custom types can also be generic, taking contained types as
+  parameters.
+</p>
+<p>
+  Here a generic <code>Option</code> type is defined, which is used to represent
+  a value that is either present or absent. This type is quite useful! The
+  <code>gleam/option</code> module defines it so you can use it in your Gleam
+  projects.
+</p>
diff --git a/src/content/chapter3_data_types/lesson05_nil/code.gleam b/src/content/chapter3_data_types/lesson06_nil/code.gleam
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diff --git a/src/content/chapter3_data_types/lesson06_results/code.gleam b/src/content/chapter3_data_types/lesson07_results/code.gleam
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diff --git a/src/content/chapter3_data_types/lesson07_bit_arrays/code.gleam b/src/content/chapter3_data_types/lesson08_bit_arrays/code.gleam
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