[store] Basic content store implementation.

- Bump Telegram Bot Framework to 0.6.9-gf1e77653ff

modules/ContentStore/Model/CatImage.cs

@@ -0,0 +1,7 @@
+namespace West.TelegramBot.ContentStore.Model;
+
+public class AnimalImage
+{
+    public string Id { get; set; } = null!;
+    public string Url { get; set; } = null!;
+}

modules/ContentStore/Model/OBoobsItem.cs

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+namespace West.TelegramBot.ContentStore.Model;
+
+public class OBoobsItem
+{
+    public int Id { get; set; }
+    public int Rank { get; set; }
+    public string? Author { get; set; }
+    public string? Model { get; set; }
+    public string Preview { get; set; } = string.Empty;
+}

modules/ContentStore/Model/RandomMedia.cs

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+using Telegram.Bot.Types;
+using Telegram.Bot.Types.Enums;
+
+namespace West.TelegramBot.ContentStore.Model;
+
+public class RandomMedia
+{
+    public RandomMedia(string url, string? caption = null)
+    {
+        Url = url;
+        Caption = caption;
+    }
+
+    public string Url;
+    public string? Caption;
+
+    public InputMediaType Type { get; set; } = InputMediaType.Photo;
+}

modules/ContentStore/Model/StoreItem.cs

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+using Telegram.Bot.Types.ReplyMarkups;
+
+namespace West.TelegramBot.ContentStore.Model;
+
+class StoreItem
+{
+    public string Id;
+    public readonly string Name;
+    public readonly double Price;
+
+    public StoreItem(string id, string name, double price)
+    {
+        Id = id;
+        Name = name;
+        Price = price;
+    }
+
+    public InlineKeyboardButton ToButton(long userId)
+    {
+        return new InlineKeyboardButton($"{Name} ({Price})")
+        {
+            CallbackData = $"store|{userId}|purchase|{Id}"
+        };
+    }
+}