update readme

README.md

@@ -5,8 +5,21 @@
 
 This custom middleware is for those who prefer to use Express but want to use the Joi validation library to validate the query, params, and body of requests.
 
+
 ## Usage
 
+Install with NPM:
+
+```
+npm install express-joi-validate --save
+```
+
+Or with Yarn:
+
+```
+yarn add express-joi-validate
+```
+
 Without route validation, an endpoint may look something like this:
 
 ```js
@@ -28,7 +41,24 @@ const contactSchema = {
 app.get('/contacts/:id', validate(contactSchema), contactsHandler);
 ```
 
-For detailed usage and more examples, see the blog post [Express route param validation (Node.js)](https://tinaciousdesign.com/blog/express-route-param-validation-nodejs).
+In TypeScript, it would look like this:
+
+```typescript
+import Joi, { SchemaMap } from '@hapi/joi';
+import validate from 'express-joi-validate';
+
+const contactSchema: SchemaMap = {
+  params: {
+    id: Joi.number().required()
+  }
+};
+
+app.get('/contacts/:id', validate(contactSchema), contactsHandler);
+```
+
+Note: for the above, the type `SchemaMap` is inferred and not required.
+
+For more information about this library, see the blog post [Express route param validation (Node.js)](https://tinaciousdesign.com/blog/express-route-param-validation-nodejs).
 
 ## Development