[store] Basic content store implementation.

- Bump Telegram Bot Framework to 0.6.9-gf1e77653ff

modules/ContentStore/Model/StoreItem.cs

@@ -0,0 +1,25 @@
+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}"
+        };
+    }
+}