chore(readme): add install instructions for node module (#15)

MrYuion · MrYuion · commit fa3ceb329c6b · 2022-08-16T14:17:58.000+10:00
diff --git a/README.md b/README.md
@@ -24,6 +24,10 @@ Based on work by
 
 ## Usage
 
+### Install
+
+Install the node module with `npm install ts-md5`
+
 ### Basic Hashing
 
 1. Import the class
