added interface for query, comments in code updated

src/Interfaces/QueryInterface.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace RouterOS\Interfaces;
+
+/**
+ * Interface QueryInterface
+ * @package RouterOS\Interfaces
+ * @since 0.2
+ */
+interface QueryInterface
+{
+    /**
+     * Append to array yet another attribute of query
+     *
+     * @param   string $word
+     * @return  $this
+     */
+    public function add(string $word): self;
+
+    /**
+     * Get attributes array of current query
+     *
+     * @return  array
+     */
+    public function getAttributes(): array;
+
+    /**
+     * Get endpoint of current query
+     *
+     * @return  string
+     */
+    public function getEndpoint(): string;
+
+    /**
+     * Build body of query
+     *
+     * @return  array
+     */
+    public function getQuery(): array;
+}

src/Query.php

@@ -2,10 +2,16 @@
 
 namespace RouterOS;
 
-class Query
-{
+use RouterOS\Interfaces\QueryInterface;
 
 /**
+ * Class Query
+ * @package RouterOS
+ * @since 0.1
+ */
+class Query implements QueryInterface
+{
+    /**
      * Array of query attributes
      * @var array
      */
@@ -31,15 +37,17 @@ class Query
      * Append to array yet another attribute of query
      *
      * @param   string $word
-     * @return  $this
+     * @return  QueryInterface
      */
-    public function add(string $word): self
+    public function add(string $word): QueryInterface
     {
         $this->_attributes[] = $word;
         return $this;
     }
 
     /**
+     * Get attributes array of current query
+     *
      * @return  array
      */
     public function getAttributes(): array
@@ -48,6 +56,8 @@ class Query
     }
 
     /**
+     * Get endpoint of current query
+     *
      * @return  string
      */
     public function getEndpoint(): string