update readme

README.md

@@ -4,4 +4,40 @@
 
 Accept Mpesa payments on your Vendure store.
 
-🚀 **WORK IN PROGRESS**
+## Installation
+
+```bash
+yarn add vendure-mpesa-plugin
+```
+
+## Usage
+
+1. Add the MpesaPlugin to your `VendureConfig` plugins array.
+
+```ts
+import { MpesaPlugin } from "vendure-mpesa-plugin"
+
+export const config: VendureConfig = {
+    // ...
+    plugins: [
+        // ...
+        MpesaPlugin.init({
+            consumerKey: "YOUR_CONSUMER_KEY",
+            consumerSecret: "YOUR_CONSUMER_SECRET",
+            shortCode: "YOUR_SHORT_CODE",
+            shortCodeType: "SHORTCODE_TYPE",
+            passkey: "YOUR_PASSKEY",
+            environment: "APP_ENVIRONMENT",
+            vendureHost: "https://yourvendurestore.com"
+        })
+    ]
+}
+```
+
+2. Start the server and navigate to `Settings > Payment methods`. Add a new payment method, selecting `Lipa na Mpesa Online` as the handler.
+
+> Note: Select the 'Check whether Mpesa supports the payment' eligibility checker when creating the payment method.
+
+## Reference
+
+-   [Mpesa Daraja API Docs](https://developer.safaricom.co.ke/Documentation)