Updated Readme

Author: ShubhamSKadam

README.md

@@ -4,13 +4,15 @@
 
 ## Contents -
 
--   #### [Variables and Data Types](/1_variables_and_data_types/variablesDataTypes.md)
--   #### [Operators](/2_Operators/Operators.md)
--   #### [Logic and Control Flow](/3_Logic_and_Control_flow/LogicAndControlFlow.md)
--   #### [Functions](/4_Functions/Functions.md)
--   #### [Hoisting and Closures](/5_Hoisting_and_Closure/HoistingAndClosure.md)
--   #### [Strings in Detail](/6_Strings_in_detail/strings.md)
--   #### [Arrays in Detail](/7_Arrays_in_detail/Arrays.md)
--   #### [Objects in Detail](/8_Objects_in_detail/objects.md)
--   #### [Value vs Reference](/9_Value_vs_Reference/value_vs_reference.md)
--   #### [DOM](/10_DOM/dom.md)
+- #### [Variables and Data Types](/1_variables_and_data_types/variablesDataTypes.md)
+- #### [Operators](/2_Operators/Operators.md)
+- #### [Logic and Control Flow](/3_Logic_and_Control_flow/LogicAndControlFlow.md)
+- #### [Functions](/4_Functions/Functions.md)
+- #### [Hoisting and Closures](/5_Hoisting_and_Closure/HoistingAndClosure.md)
+- #### [Strings in Detail](/6_Strings_in_detail/strings.md)
+- #### [Arrays in Detail](/7_Arrays_in_detail/Arrays.md)
+- #### [Objects in Detail](/8_Objects_in_detail/objects.md)
+- #### [Value vs Reference](/9_Value_vs_Reference/value_vs_reference.md)
+- #### [DOM](/10_DOM/dom.md)
+- #### [Classes, this and new keyword](/11_Classes_this_and_new_keyword/11.md)
+- #### [Asynchronous Concepts](/12_Asynchronous_Concepts/12.md)