Adding CEP_11 folder and updating readme (#362)

Co-authored-by: shusharm <shusharm@adobe.com>

Author: shubham-adobe

CEP_11.x/CEPEngine_extensions.js

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+CEP 11 Known Issues & FAQ
+====================
+
+### Following are the known issues in CEP 10.0 and above. Please keep these in mind while creating your own extension...
+
+## Issue 1 :
+  Drag events not fired while debugging an extension. 
+    
+    Workaround: Deactivate the screencast by selecting the "Toggle device Toolbar" in the chrome inspect window. 
+    Once done, Drag operation can be performed even while debugging the extension. 
+  ![Toggle device Toolbar](./images/issues/dragDebug.png)
+
+## Issues existing in CEP 9 and above  
+    
+    ### Issue 1: 
+    In Windows, the API cep.fs.stat() is not able to access file of size greater than 4GB 
+
+
+---
+
+## FAQ 
+
+*  **Refer the migration Guidelines for [CEP 10 to CEP 11](./CEP%2011.1%20HTML%20Extension%20Cookbook.md#migration-from-cep-10-to-cep-11)**
+
+*  **If similar error is seen in debug console, confirm\verfiy the following**
+
+    ![require not function](./images/issues/requireNotFunction.png)
+
+    * Confirm CEPEngine_extensions.js is NOT integrated in your extension
+
+    * Node could be crashing. Please update node_modules with CEP 10 supported [node version](./CEP%2011.1%20HTML%20Extension%20Cookbook.md#chromium-embedded-framework-cef). 
+   
+
+    
+