Added resources for Java streams & generics (#1778)

* Resources added for Java Streams & Generics

* Unwanted space removed

* Update content/roadmaps/110-java/content/101-java-advanced-topics/105-streams.md

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

content/roadmaps/110-java/content/101-java-advanced-topics/100-generics.md

@@ -1 +1,9 @@
 # Generics
+
+Java Generic methods and generic classes enable programmers to specify, with a single method declaration, a set of related methods, or with a single class declaration, a set of related types, respectively.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>   
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.geeksforgeeks.org/generics-in-java/'>Generics in Java</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.tutorialspoint.com/java/java_generics.htm'>Java - Generics</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.javatpoint.com/generics-in-java'>Generics in Java</BadgeLink>
+<BadgeLink badgeText='Watch' href='https://www.youtube.com/watch?v=XMvznsY02Mk'>Generics in Java</BadgeLink>

content/roadmaps/110-java/content/101-java-advanced-topics/105-streams.md

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 # Streams
+
+Java provides a new additional package in Java 8 called java.util.stream. This package consists of classes, interfaces and enum to allows functional-style operations on the elements. You can use stream by importing java.util.stream package.
+
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>   
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.geeksforgeeks.org/stream-in-java/'>Streams in Java</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.javatpoint.com/java-8-stream'>Java 8 Stream</BadgeLink>
+<BadgeLink badgeText='Watch' href='https://www.youtube.com/watch?v=VNovNwHr9jY'>Streams API Tutorial in Java 8+</BadgeLink>
+<BadgeLink colorScheme='purple' badgeText='Watch' href='https://www.youtube.com/watch?v=t1-YZ6bF-g0'>Java 8 Streams Tutorial</BadgeLink>