Add conditionals in Java (#1731)

* Update 102-conditionals.md

I've added content in the roadmap documentation to study conditionals in Java.

* Update content/roadmaps/110-java/content/100-java-fundamentals/102-conditionals.md

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

content/roadmaps/110-java/content/100-java-fundamentals/102-conditionals.md

@@ -1 +1,13 @@
-# Conditionals
+# Conditionals
+
+Java has the following conditional statements:
+
+* Use `if` to specify a block of code to be executed, if a specified condition is true
+* Use `else` to specify a block of code to be executed if the same condition is false
+* Use `else if` to specify a new condition to test; if the first condition is false
+* Use `switch` to specify many alternative blocks of code to be executed
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.educative.io/answers/what-are-conditional-statements-in-programming'>What are Conditional statements?</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.javatpoint.com/java-if-else'>Conditionals in Java</BadgeLink>
+<BadgeLink badgeText='Watch' href='https://www.youtube.com/watch?v=YPK6NYMJt_A'>Conditionals in Java</BadgeLink>