Add content to Angular Roadmap:Basics (#2428)

* Add content to Angular Roadmap - Basics - Dependency Injection

* Add content to Angular Roadmap:Basics[Routing]

* Add content to Angular Roadmap:Basics[Routing]

content/roadmaps/104-angular/content/102-angular-basics/106-routing.md

@@ -1 +1,7 @@
 # Routing
+
+Routing in Angular allows the users to create a single-page application with multiple views and allows navigation between them.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='blue' badgeText='Official Website' href='https://angular.io/guide/routing-overview'>Angular Routing</BadgeLink>
+<BadgeLink colorScheme='blue' badgeText='Official Website' href='https://angular.io/guide/router'>Common Routing Tasks</BadgeLink>

content/roadmaps/104-angular/content/102-angular-basics/readme.md

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-# Angular basics
+# Angular Basics
+
+Angular is an strong front-end JavaScript framework which means that it enforces a certain style of application development and project structure that developers need to follow to develop apps with Angular. However, it also offers enough flexibility to allow you to structure your project in an understandable and manageable manner.
+
+In this module, we will have a look at some of the most basic concepts that you need to understand before diving into the framework with more advanced concepts.