Update the readme

Author: richardwilkes

README.md

@@ -35,6 +35,10 @@ use standard library code, the package has been named the same as the standard l
 
 - **`geom`** - Generic geometric primitives including `Point[T]`, `Rect[T]`, `Size[T]`, `Line[T]`, `Matrix[T]`, and `Insets[T]` with type conversion utilities.
 
+- **`geom/poly`** - Provides polygon operations using fixed-point arithmetic for reliable geometric computations.
+
+- **`geom/visibility`** - 2D visibility polygon computation for line-of-sight calculations.
+
 ### Data Structures and Collections
 
 - **`collection/bitset`** - Efficient bitset implementation for working with sets of bits.

geom/poly/point.go

@@ -15,6 +15,7 @@ import (
 	"github.com/richardwilkes/toolbox/v2/geom"
 )
 
+// Point holds a fixed-point 2D coordinate.
 type Point struct {
 	X Num
 	Y Num

geom/poly/rect.go

@@ -13,6 +13,7 @@ import (
 	"github.com/richardwilkes/toolbox/v2/geom"
 )
 
+// Rect holds a fixed-point rectangle.
 type Rect struct {
 	Point
 	Size

geom/poly/size.go

@@ -15,6 +15,7 @@ import (
 	"github.com/richardwilkes/toolbox/v2/geom"
 )
 
+// Size holds a fixed-point size.
 type Size struct {
 	Width  Num
 	Height Num