add docs for ItemCollection

README.md

@@ -43,6 +43,7 @@ Next, run the Composer update command from the Terminal:
 ## HOW TO USE
 * [Usage](#usage)
 * [Conditions](#conditions)
+* [Items](#items)
 * [Instances](#instances)
 * [Exceptions](#exceptions)
 * [Events](#events)
@@ -521,6 +522,50 @@ Remove conditions by type: **Cart::removeConditionsByType($type)**
 public function removeConditionsByType($type)
 ```
 
+## Items
+
+The method **Cart::getContent()** returns a collection of items. 
+To get the id of an item, use the property **$item->id**.
+To get the name of an item, use the property **$item->name**.
+To get the quantity of an item, use the property **$item->quantity**.
+To get the attributes of an item, use the property **$item->attributes**.
+To get the price of a single item without the conditions applied, use the property **$item->price**.
+To get the subtotal of an item without the conditions applied, use the method **$item->getPriceSum()**. 
+```php
+/**
+* get the sum of price
+*
+* @return mixed|null
+*/
+public function getPriceSum()
+
+```
+
+To get the price of a single item without the conditions applied, use the method **$item->getPriceWithConditions()**.
+```php
+/**
+* get the single price in which conditions are already applied
+*
+* @return mixed|null
+*/
+public function getPriceWithConditions() 
+
+```
+
+To get the subtotal of an item with the conditions applied, use the method **$item->getPriceSumWithConditions
+```php
+/**
+* get the sum of price in which conditions are already applied
+*
+* @return mixed|null
+*/
+public function getPriceSumWithConditions()
+
+```
+
+Note: When you get price with conditions applied, only the conditions assigned to the current item will be calculated. 
+Cart condition won't be applied to price.
+
 ## Instances
 
 You may also want multiple cart instances on the same page without conflicts.
@@ -611,7 +656,10 @@ foreach($items as $item)
 {
  $item->id; // the Id of the item
  $item->name; // the name
- $item->price; // the price
+ $item->price; // the single price without condition applied
+ $item->getPriceSum(); // the subtotal without conditions applied
+ $item->getPriceWithConditions(); // the single price with condition applied
+ $item->getPriceSumWithConditions(); // the subtotal with conditions applied
  $item->quantity; // the quantity
  $item->attributes; // the attributes
 
@@ -633,7 +681,12 @@ $items->each(function($item)
 {
  $item->id; // the Id of the item
  $item->name; // the name
- $item->price; // the price
+ $item->price; // the single price without condition applied
+ $item->getPriceSum(); // the subtotal without conditions applied
+ $item->getPriceWithConditions(); // the single price with condition applied
+ $item->getPriceSumWithConditions(); // the subtotal with conditions applied
+ $item->price; // the single price
+ $item->price; // the single price
  $item->quantity; // the quantity
  $item->attributes; // the attributes