Add main.go with generic Optional definition

This is the core of the optional package.

1 files changed, 6 insertions, 0 deletions

diff --git a/optional/main.go b/optional/main.go
new file mode 100644
index 0000000..6cc494a
--- /dev/null
+++ b/optional/main.go
@@ -0,0 +1,6 @@
+package optional
+
+type Optional[T any] struct {
+	Value  T
+	Exists bool
+}