Update QuoteRepository.cs

Add quote search by keyword and text

src/NadekoBot/Services/Database/Repositories/Impl/QuoteRepository.cs

@@ -23,5 +23,11 @@ namespace NadekoBot.Services.Database.Repositories.Impl
             var rng = new NadekoRandom();
             return _set.Where(q => q.GuildId == guildId && q.Keyword == keyword).OrderBy(q => rng.Next()).FirstOrDefaultAsync();
         }
+        public Task<Quote> SearchQuoteKeywordTextAsync(ulong guildId, string keyword, string text)
+        {
+		      			
+          	var rngk = new NadekoRandom();
+            return _set.Where(q => q.Text.Contains(text) && q.GuildId == guildId && q.Keyword == keyword).OrderBy(q => rngk.Next()).FirstOrDefaultAsync();
+		}
     }
 }