added README for Cordova samples

Author: Igor Khomenko

samples/chat-cordova/README.md

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+# QuickBlox Apache Cordova (PhoneGap) Chat code sample
+
+## Overview
+
+This is a code sample for [QuickBlox](https://quickblox.com/) platform. It is a great way for developers using QuickBlox platform to learn how to integrate private and group chat, add text and image attachments sending into your application.
+
+## Sample description
+
+<img src="http://quickblox.com/developers//images/7/74/Cordova_chat_sample1.png" border="1" alt="1-1 ang Group chats" width="600"> 
+
+It allows:
+
+1. Authenticate with Quickblox Chat and REST.
+2. Receive and display list of dialogs.
+3. Modify dialog by adding occupants.
+4. Real-time chat messaging and attachment's handling.
+5. Offline storage for messages, dialogs and users.
+
+
+## Documentation
+
+Original sample description & setup guide - [Apache Cordova (PhoneGap) Chat code sample](http://quickblox.com/developers/Sample-chat-cordova)
+
+

samples/webrtc-cordova/README.md

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+# QuickBlox Apache Cordova (PhoneGap) VideoChat (WebRTC) code sample
+
+## Overview
+
+This is a code sample for [QuickBlox](https://quickblox.com/) platform. It is a great way for developers using QuickBlox platform to learn how to integrate WebRTC video calling features into your application.
+
+## Sample description
+
+<img src="http://quickblox.com/developers//images/a/a8/Webrtc_cordova_sample1.PNG" border="1" alt="List of users to have a video chat with" width="300"> 
+<img src="http://quickblox.com/developers//images/7/71/Webrtc_cordova_sample2.PNG" border="1" alt="iOS demo of Cordova Video Chat code sample" width="300"> 
+<img src="http://quickblox.com/developers//images/e/ea/Webrtc_cordova_sample3.PNG" border="1" alt="Android demo of Cordova Video Chat code sample" width="300"> 
+
+It allows:
+
+1. Have 1-1 Video Chat.
+2. Have group Video Chat.
+3. Mute video and audio tracks.
+4. Use filters for video stream.
+
+
+## Documentation
+
+Original sample description & setup guide - [Apache Cordova (PhoneGap) VideoChat (WebRTC) code sample](http://quickblox.com/developers/Sample-webrtc-cordova)
+
+