feat: create GenreService

Author: yvasyliev

src/main/java/io/github/yvasyliev/deezer/service/GenreService.java

@@ -0,0 +1,34 @@
+package io.github.yvasyliev.deezer.service;
+
+import feign.Headers;
+import feign.Param;
+import feign.RequestLine;
+import io.github.yvasyliev.deezer.model.Artist;
+import io.github.yvasyliev.deezer.model.Genre;
+import io.github.yvasyliev.deezer.model.Page;
+import io.github.yvasyliev.deezer.model.Radio;
+
+import java.util.concurrent.CompletableFuture;
+
+@Headers("Accept: application/json")
+public interface GenreService {
+    /**
+     * Returns all artists for a genre.
+     *
+     * @param genreId the genre ID
+     * @return all artists for a genre
+     */
+    @RequestLine("GET /genre/{genreId}/artists")
+    CompletableFuture<Page<Artist>> getArtists(@Param("genreId") int genreId);
+
+    @RequestLine("GET /genre/{genreId}")
+    CompletableFuture<Genre> getGenre(@Param("genreId") int genreId);
+
+    @RequestLine("GET /genre")
+    CompletableFuture<Page<Genre>> getGenres();
+
+    //TODO: get podcasts
+
+    @RequestLine("GET /genre/{genreId}/radios")
+    CompletableFuture<Page<Radio>> getRadios(@Param("genreId") int genreId);
+}