Add comments for count variable and assignment

Added comments to explain variable declaration and assignment.

Author: anitahy73

Sprint-2/1-key-exercises/1-count.js

@@ -3,4 +3,5 @@ let count = 0;
 count = count + 1;
 
 // Line 1 is a variable declaration, creating the count variable with an initial value of 0
+// Describe whaWt line 3 is doing, in particular focus on what = is doing
 // Describe what line 3 is doing, in particular focus on what = is doing