Updated readme to cover NumericTextModifier

Author: amayers

README.md

@@ -1,23 +1,26 @@
 # NumericText
 
-![Build](https://github.com/amayers/NumericText/workflows/Swift/badge.svg)
-
 A simple SwiftUI `TextField` that limits user input to numbers.
 
 The most common response in https://stackoverflow.com/questions/58733003/swiftui-how-to-create-textfield-that-only-accepts-numbers (the top search result), advocates just setting a numeric keyboard. But that totally misses cases when used with hardware keyboards. Many of the suggested  
 
-This `NumericTextField` prevents any non-numeric text input, no matter the source (paste, external keyboard). You can choose to allow integers or floating point. 
+This `NumericTextModifier` observes a `String` value for changes, and when it is changed, it filters out any non-numeric characters and updates the string. Then it converts that string to a `NSNumber` for easier use. You can choose to allow integers or floating point. 
+
+`NumericTextField` uses `NumbericTextModifier` and exposes only the `NSNumber` in the text. It prevents any non-numeric text input, no matter the source (paste, external keyboard). It also manages the keyboard type to match the type of numbers you said to allow.
+
 Standard `TextFields` have a `Formatter` that you can pass in, that will be used to format/validate input. However this only occurs when the user finishes editing, not for every keystroke. So a user can type `123abc4` and see that in the text field, then when they hit return it will change to `1234`. That's really not ideal. With `NumericTextField` when they type a non-numeric character it is ignored and never shows up in the text field.
 
 
 ## Usage:
 
+### NumericTextField
+
 It works just like `TextField` but you are binding it to `NSNumber?` instead of a `String`.
 
 ```
 // Inside your view
-@State private static var int: NSNumber?
-@State private static var double: NSNumber?
+@State private var int: NSNumber?
+@State private var double: NSNumber?
 
 var body: Some View {
     VStack {
@@ -28,6 +31,26 @@ var body: Some View {
 
 ```
 
+### NumericTextModifier
+
+```
+// Inside your view
+@State private var int: NSNumber?
+@State private var intString = ""
+@State private var double: NSNumber?
+@State private var doubleString = ""
+
+var body: Some View {
+    VStack {
+        TextField("Int", text: $intString)
+            .numericText(text: $intString, number: $int, isDecimalAllowed: false)
+        TextField("Double", text: $doubleString)
+            .numericText(text: $doubleString, number: $double, isDecimalAllowed: true)
+    }
+}
+
+```
+
 ## Installation
 
 Use Swift Package Manager or just drag and drop the two source files into your project. It supports iOS 14, macOS 10.16/11, tvOS 14, watchOS 7.