update README

Author: lgreydev

README.md

@@ -3,6 +3,8 @@
 
 In this project, I have collected various best practices and iOS development tips. This is my personal development assistant.
 
+## Index
+
 - [**Clean Code**](#clean-code)
     - [Clean Class](#clean-class)
     - [Life Cycle](#life-cycle)
@@ -373,7 +375,6 @@ The main MARKs for splitting the code into logically related blocks and their se
 
 ## **Protocols**
 
-
 ### [CustomStringConvertible](https://github.com/lgreydev/Help/blob/master/Help/Protocols/CustomStringConvertible.swift)
 A type with a customized textual representation.
 Types that conform to the CustomStringConvertible protocol can provide their own representation to be used when converting an instance to a string. The String(describing:) initializer is the preferred way to convert an instance of any type to a string. If the passed instance conforms to CustomStringConvertible, the String(describing:) initializer and the print(_:) function use the instance’s custom description property. Accessing a type’s description property directly or using CustomStringConvertible as a generic constraint is discouraged.
@@ -458,10 +459,12 @@ mike > bob // true
 
 ```
 
+**[⬆ Back to Index](#index)**
 
-## **Extensions**
 
 
+## **Extensions**
+
 ### [IntᐩRandom](https://github.com/lgreydev/Help/blob/master/Help/Extensions/Int+Random.swift)
 An extension for Int that returns a random number works with range  of numbers. Negative numbers converts to positive.
 - **Example:** 17.random will return 0 to 17 (not including 17).
@@ -514,6 +517,9 @@ extension String {
 
 ```
 
+**[⬆ Back to Index](#index)**
+
+
 
 ## **Working Code**
 
@@ -595,7 +601,6 @@ safari.getImage(text: "page 3")
 
 
 
-
 ### [Type Casting](https://github.com/lgreydev/Help/blob/master/Help/WorkingCode/TypeCasting.swift)
 Type casting is a way to check the type of an instance, or to treat that instance as a different superclass or subclass from somewhere else in its own class hierarchy.
 
@@ -884,6 +889,8 @@ showTower(for: difficulty ?? .unknown)
 
 ```
 
+**[⬆ Back to Index](#index)**
+
 
 
 ## **UIKit**
@@ -954,6 +961,10 @@ class SameObject: Codable {
 
 ```
 
+**[⬆ Back to Index](#index)**
+
+
+
 ## Table View
 
 ### [Move Row](https://github.com/lgreydev/Help/blob/master/Help/UIKit/TableView/MoveRow.swift)
@@ -1216,6 +1227,9 @@ class SecondViewController: UIViewController {
 
 ```
 
+**[⬆ Back to Index](#index)**
+
+
 
 ## **Features**
 
@@ -1360,13 +1374,13 @@ private func respondToSwipeGesture(gesture: UIGestureRecognizer) {
 
 ```
 
+**[⬆ Back to Index](#index)**
+
 
 
 ## **Design Patterns**
 [Book Design Patterns](https://en.wikipedia.org/wiki/Design_Patterns)
 
-
-
 ### [Factory Method](https://github.com/lgreydev/Help/blob/master/Help/DesignPatterns/FactoryMethod.swift)
 [Factory Method RU](https://refactoring.guru/ru/design-patterns/factory-method)
 
@@ -1450,11 +1464,11 @@ class SomeViewController: UIViewController {
 
 ```
 
+**[⬆ Back to Index](#index)**
 
 
-## **Leet Code**
-
 
+## **Leet Code**
 
 ### [Pascal Triangle](https://github.com/lgreydev/Help/blob/master/Help/LeetCode/Pascal'sTriangle.swift)