Add RpcException and StandardException classes

src/Socialbox/Exceptions/RpcException.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Socialbox\Exceptions;
+
+use Exception;
+use Throwable;
+
+class RpcException extends Exception
+{
+    /**
+     * Throws when there is an RPC exception that couldn't be handled
+     *
+     * @param string $message
+     * @param int $code
+     * @param Throwable|null $previous
+     */
+    public function __construct(string $message="", int $code=0, ?Throwable $previous=null)
+    {
+        parent::__construct($message, $code, $previous);
+    }
+}

src/Socialbox/Exceptions/StandardException.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Socialbox\Exceptions;
+
+use Exception;
+use Socialbox\Enums\StandardError;
+use Throwable;
+
+class StandardException extends Exception
+{
+    /**
+     * Thrown as a standard error, with a message and a code
+     *
+     * @param string $message
+     * @param StandardError $code
+     * @param Throwable|null $previous
+     */
+    public function __construct(string $message, StandardError $code, ?Throwable $previous=null)
+    {
+        parent::__construct($message, $code->value, $previous);
+    }
+
+    public function getStandardError(): StandardError
+    {
+        return StandardError::from($this->code);
+    }
+}