Update README.md

README.md

@@ -1,15 +1,87 @@
-# GTChatKit
+# GTChatKit: iOS ChatKit built on Texture
 
 [![CI Status](http://img.shields.io/travis/Geektree0101/GTChatKit.svg?style=flat)](https://travis-ci.org/GeekTree0101/GTChatKit)
 [![Version](https://img.shields.io/cocoapods/v/GTChatKit.svg?style=flat)](http://cocoapods.org/pods/GTChatKit)
 [![License](https://img.shields.io/cocoapods/l/GTChatKit.svg?style=flat)](http://cocoapods.org/pods/GTChatKit)
 [![Platform](https://img.shields.io/cocoapods/p/GTChatKit.svg?style=flat)](http://cocoapods.org/pods/GTChatKit)
 
-## Example
+GTChatKit is build on Texture for easy building iOS Message Application. 
+Also it support Bi-directional Paging CollectionView
+
+Why? Texture
+Texture is an iOS framework built on top of UIKit that keeps even the most complex user interfaces smooth and responsive. more information [Here](http://texturegroup.org/)
+
+## Usage
+[example source](https://github.com/GeekTree0101/GTChatKit/tree/master/Example)
+
+### 1. Create GTChatNodeController subclass
+
+``` swift
+class ChatNodeController: GTChatNodeController { ... }
+```
+> and you can create subclass instance 
+``` swift
+let viewController = ChatNodeController()
+```
+> if you want custom collection flow layout follow it
+``` swift
+let customFlowLayout = YOURCUSTOMCollectionFlowLayout()
+let viewController = GTChatNodeController(layout: customFlowLayout)
+```
+
+### 2. GTChatNodeDelegate implementation
+```swift
+extension ChatNodeController: GTChatNodeDelegate {
+    func shouldAppendBatchFetch(for chatNode: ASCollectionNode) -> Bool {
+        // Should Append Batch Fetch
+        return true
+    }
+
+    func shouldPrependBatchFetch(for chatNode: ASCollectionNode) -> Bool {
+        // Should Prepend Batch Fetch
+        return true
+    }
+
+    func chatNode(_ cahtNode: ASCollectionNode, willBeginAppendBatchFetchWith context: ASBatchContext) {
+        // Network Call Handling
+        // If Network Call Completed then context should be completed
+        // required example
+        // eg) self.completeBatchFetching(true, endDirection: .none)
+    }
+
+    func chatNode(_ cahtNode: ASCollectionNode, willBeginPrependBatchFetchWith context: ASBatchContext) {
+        ...
+    }
+}
+```
+
+### 3. completeBatchFetching
+
+``` swift
+    func completeBatchFetching(_ complated: Bool, endDirection: BatchFetchDirection) { ... }
+
+    endDirection: automatically block append or prepend batch fetching
+    self.completeBatchFetching(true, endDirection: .append) -> no more append doesn't work
+    self.completeBatchFetching(true, endDirection: .prepend) -> no more prepend doesn't work
+```
+
+### 4. pagingStatus property
+
+you can see 4 steps paging status
+1. initial
+2. appending
+3. prepending
+4. some
+
+(2), (3) is Loading status
+(4: some) is means networking is finished and got new items
+you do not need to be aware of (1: initial status) existence
 
-To run the example project, clone the repo, and run `pod install` from the Example directory first.
 
 ## Requirements
+- Xcode <~ 9.0
+- iOS <~ 9.x
+- Swift <~ 3.x, 4.0
 
 ## Installation