added Collection endpoint and types, buildable option interfaces

src/types/collections.ts

@@ -0,0 +1,16 @@
+import { Movie } from ".";
+
+export interface Collection {
+	id: number;
+	backdrop_path: string;
+	name: string;
+	poster_path: string;
+	adult: boolean;
+	original_language: string;
+	original_name: string;
+	overview: string;
+}
+
+export interface DetailedCollection extends Collection {
+  parts: Movie[]
+}