10-Asynchronous JavaScript code added

Author: ChinmayKaitade

10_Async_JavaScript/37_Async_JavaScript_Fundamentals/37_async_javascript.md

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+# Asynchronous JavaScript Fundamentals 🚀🔥
+
+- JavaScript is a Synchronous Language by default but we can modify it to Async. Line by Line Code is Executed.
+- JavaScript is a Single threaded Language.
+
+### Execution Context
+
+- Execute one line of code at a time.
+- Each operation waits for the last one to complete before executing.
+
+Watch Video - **_Execution Context_**
+1.Global Execution Context (GEC)
+2.Function Execution Context (FEC)
+3.Memory Heap --> // - Memory Creation Phase (Creation Phase) --> Space is allocated to declared variables and can't execute here.
+4.Call Stack
+
+## Blocking Code Vs Non-Blocking Code ✅
+
+Blocking Code ✔️
+
+- Block the flow of program
+- Read File Synchronously
+
+Non-Blocking Code ✔️
+
+- Doesn't block execution
+- Read File Asynchronously
+
+
+![Image](Async%20Await.jpg)