Update docs for clearer reference to npm (#32)

README.md

@@ -1,6 +1,11 @@
 Utility for extracting and validating phone numbers. Extracts an array of phone numbers from an inputted string, validates that these numbers appear genuine and provide data about those phone numbers.
 
-[![License](https://img.shields.io/badge/License-BSD_3--Clause-blue.svg)](https://opensource.org/licenses/BSD-3-Clause) ![Statements](https://img.shields.io/badge/statements-100%25-brightgreen.svg?style=flat) ![Branches](https://img.shields.io/badge/branches-100%25-brightgreen.svg?style=flat) ![Functions](https://img.shields.io/badge/functions-100%25-brightgreen.svg?style=flat) ![Lines](https://img.shields.io/badge/lines-100%25-brightgreen.svg?style=flat)
+[![License](https://img.shields.io/badge/License-BSD_3--Clause-blue.svg)](https://opensource.org/licenses/BSD-3-Clause)
+[![Install from NPM](https://img.shields.io/badge/npm-@yext/phonenumber--util-blue)](https://www.npmjs.com/package/@yext/phonenumber-util)
+![Statements](https://img.shields.io/badge/statements-100%25-brightgreen.svg?style=flat)
+![Branches](https://img.shields.io/badge/branches-100%25-brightgreen.svg?style=flat)
+![Functions](https://img.shields.io/badge/functions-100%25-brightgreen.svg?style=flat)
+![Lines](https://img.shields.io/badge/lines-100%25-brightgreen.svg?style=flat)
 
 ### Scripts
 
@@ -38,6 +43,12 @@ npx vitest run --coverage
 
 The returned object will include a `rawNumber` value. This value is the return of the exact value passed to the function. No sanitization occurs with this value. If you reference this number, ensure you sanitize it _BEFORE_ passing to this function.
 
+### Install
+
+```bash
+npm i @yext/phonenumber-util --save
+```
+
 ### Usage
 
 There is additional functionality exposed as `export`, but the primary expected use case is: