docs: Create configuration.md

docs/configuration.md

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+# Configuration
+Though this package is crafted to suit most of your needs by default, you can edit the configuration file to suit certain demands.
+
+## Configure default wallet
+Customize `name`,`slug` and `meta` of default wallet.
+
+```php[config/wallet.php]
+'default' => [
+            'name' => 'Ethereum',
+            'slug' => 'ETH',
+            'meta' => [],
+        ],
+```
+## Extend base Wallet model
+You can extend base Wallet model by creating a new class that extends `Bavix\Wallet\Models\Wallet` and registering the new class in `config/wallet.php`.
+Example `MyWallet.php`
+
+```php[App/Models/MyWallet.php]
+use Bavix\Wallet\Models\Wallet as WalletBase;
+
+class MyWallet extends WalletBase {
+    public function helloWorld(): string { return "hello world"; }
+}
+```
+### Register base Wallet model
+
+```php[config/wallet.php]
+    'wallet' => [
+        'table' => 'wallets',
+        'model' => MyWallet::class,
+        'creating' => [],
+        'default' => [
+            'name' => 'Default Wallet',
+            'slug' => 'default',
+            'meta' => [],
+        ],
+    ],
+```
+```php
+   echo $user->wallet->helloWorld();
+```
+This same method above, can be used to extend the base `Transfer` and `Transaction` models and registering the extended models in the configuration file.
+