update readme

README.md

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 # Laravel Exchange Rate
+Allows to convert money from one currency to another using latest exchange rate on market
+
+## Installation
+
+```php
+$ composer install norbybaru/exchange-rate
+```
+Publish Config `config/exchange.php`
+```php
+$ php artisan vendor:publish --provider="NorbyBaru\ExchangeRate\ExchangeRateServiceProvider"
+```
+
+Run Migration
+```php
+$ php artisan migrate
+```
+
+## Usage
+Update exchange rate to get latest rate on the market.
+Run below command to get latest exchange rate
+
+```php
+$ php artisan rate:update
+```
+
+* Get Rate
+```php
+<?php
+use NorbyBaru\ExchangeRate\Facades\Exchange;
+
+$rate = Exchange::rate("USD");
+
+```
+
+* Convert Currency
+```php
+<?php
+
+use NorbyBaru\ExchangeRate\Facades\Exchange;
+
+$money = Exchange::convert(5000, 'USD', 'ZAR');
+
+```