Initial split of the modules

NadekoBot.Core/Services/IGoogleApiService.cs

@@ -0,0 +1,35 @@
+using Google.Apis.Customsearch.v1.Data;
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace NadekoBot.Services
+{
+    public interface IGoogleApiService : INService
+    {
+        IEnumerable<string> Languages { get; }
+
+        Task<IEnumerable<string>> GetVideoLinksByKeywordAsync(string keywords, int count = 1);
+        Task<IEnumerable<(string Name, string Id, string Url)>> GetVideoInfosByKeywordAsync(string keywords, int count = 1);
+        Task<IEnumerable<string>> GetPlaylistIdsByKeywordsAsync(string keywords, int count = 1);
+        Task<IEnumerable<string>> GetRelatedVideosAsync(string url, int count = 1);
+        Task<IEnumerable<string>> GetPlaylistTracksAsync(string playlistId, int count = 50);
+        Task<IReadOnlyDictionary<string, TimeSpan>> GetVideoDurationsAsync(IEnumerable<string> videoIds);
+        Task<ImageResult> GetImageAsync(string query, int start = 1);
+        Task<string> Translate(string sourceText, string sourceLanguage, string targetLanguage);
+
+        Task<string> ShortenUrl(string url);
+    }
+
+    public struct ImageResult
+    {
+        public Result.ImageData Image { get; }
+        public string Link { get; }
+
+        public ImageResult(Result.ImageData image, string link)
+        {
+            this.Image = image;
+            this.Link = link;
+        }
+    }
+}