add docs laravel-wallet-swap

Author: rez1dent3

docs/_sidebar.md

@@ -23,6 +23,10 @@
     - [Refund](refund)
     - [Gift](gift)
     - [Cart](cart)
+    
+- Additions
+
+    - [Wallet Swap](laravel-wallet-swap)
 
 - Multi Wallets
 

docs/laravel-wallet-swap.md

@@ -0,0 +1,42 @@
+## Laravel Wallet Swap
+
+## Composer
+
+The recommended installation method is using [Composer](https://getcomposer.org/).
+
+In your project root just run:
+
+```bash
+composer req bavix/laravel-wallet-swap
+```
+
+### User model
+We need a simple model with the ability to work multi-wallets.
+
+```php
+use Bavix\Wallet\Interfaces\Wallet;
+use Bavix\Wallet\Traits\HasWallets;
+use Bavix\Wallet\Traits\HasWallet;
+
+class User extends Model implements Wallet
+{
+    use HasWallet, HasWallets;
+}
+```
+
+### Simple example
+Find wallets and translate from one to another.
+
+```php
+$usd = $user->getWallet('usd');
+$rub = $user->getWallet('rub');
+
+$usd->balance; // int(200)
+$rub->balance; // int(0)
+
+$usd->exchange(10, $rub);
+$usd->balance; // int(190)
+$rub->balance; // int(622)
+```
+
+It worked!