add link to topics in conditional logic

Author: sumn2u

en/conditional/README.md

@@ -14,4 +14,10 @@ First of all, conditions can be used to ensure that your program works, regardle
 
 The other thing conditions can do for you is allow for branching. You might have encountered branching diagrams before, for example when filling out a form. Basically, this refers to executing different “branches” (parts) of code, depending on if the condition is met or not.
 
-In this chapter, we'll learn the basis of conditional logic in JavaScript.
+In this chapter, we'll learn the basics of conditional logic in JavaScript, including the following topics:
+
+* [if](./if.md)
+* [else](./else.md)
+* [switch](./switch.md)
+* [comparators](./comparators.md)
+* [concatenate](./concatenate.md)

en/conditional/comparators.md

@@ -32,4 +32,8 @@ In order to avoid the if-else hassle, simple logical comparisons can be utilised
 let topper = marks > 85 ? "YES" : "NO";
 ```
 
-In the above example, `?` is a logical operator. The code says that if the value of marks is greater than 85 i.e. `marks > 85` , then `topper = YES` ; otherwise `topper = NO` . Basically, if the comparison condition proves true, the first argument is accessed and if the comparison condition is false, the second argument is accessed.
+In the above example, `?` is a logical operator. The code says that if the value of marks is greater than 85 i.e. `marks > 85` , then `topper = YES` ; otherwise `topper = NO` . Basically, if the comparison condition proves true, the first argument is accessed and if the comparison condition is false, the second argument is accessed. This shorthand operator is also known as the `ternary operator` as it takes three operands.
+
+```javascript
+condition ? expression1 : expression2
+```