Add info on measuring width/height to README + add Size helper function

README.md

@@ -261,9 +261,29 @@ lipgloss.HorizontalJoin(0.2, paragraphA, paragraphB, paragraphC)
 ```
 
 
+### Measuring Width and Height
+
+Sometimes you’ll want to know the width and height of text blocks when building
+your layouts:
+
+```go
+var block string = lipgloss.NewStyle().
+    Width(40).
+    Padding(2).
+    Render(someLongString)
+
+// Get the actual, phsical dimensions of the text block.
+width := lipgloss.Width(block)
+height := lipgloss.Height(block)
+
+// Here's a shorthand function.
+w, h := lipgloss.Size(block)
+```
+
+
 ### Placing Text in Whitespace
 
-Sometimes you simply want to place a block of text in whitespace.
+Sometimes you’ll simply want to place a block of text in whitespace.
 
 ```go
 // Center a paragraph horizontally in a space 80 cells wide. The height of

size.go

@@ -7,8 +7,8 @@ import (
 )
 
 // Width returns the cell width of characters in the string. ANSI sequences are
-// ignored and characters wider than one cell (such as Chinese characters) are
-// appropriately measured.
+// ignored and characters wider than one cell (such as Chinese characters and
+// emojis) are appropriately measured.
 //
 // You should use this instead of len(string) len([]rune(string) as neither
 // will give you accurate results.
@@ -30,3 +30,12 @@ func Width(str string) (width int) {
 func Height(str string) int {
 	return strings.Count(str, "\n") + 1
 }
+
+// Size returns the width and height of the string in cells. ANSI sequences are
+// ignored and characters wider than one cell (such as Chinese characters and
+// emojis) are appropriately measured.
+func Size(str string) (width, height int) {
+	width = Width(str)
+	height = Height(str)
+	return width, height
+}