Fix Readme; Create changelog

CHANGELOG.md

@@ -0,0 +1,46 @@
+CHANGELOG
+=========
+
+Mercato 0.0.1
+---------
+
+* Listen for transaction updates. If your app has unfinished transactions, you receive them immediately after the app launches
+  ```swift
+  Mercato.listenForTransactions(finishAutomatically: false) { transaction in
+    //Deliver content to the user.
+
+    //Finish transaction
+    await transaction.finish()
+  }
+```
+
+* Fetch products for the given set of product's ids
+  ```swift
+  do
+  {
+	  let productIds: Set<String> = ["com.test.product.1", "com.test.product.2", "com.test.product.3"]
+	  let products = try await Mercato.retrieveProducts(productIds: productIds)
+
+	  //Show products to the user
+  }catch{
+	  //Handle errors
+  }
+  ```
+
+* Purchase a product 
+  ```swift
+  try await Mercato.purchase(product: product, quantity: 1, finishAutomatically: false, appAccountToken: nil, simulatesAskToBuyInSandbox: false)
+  ```
+
+* Offering in-app refunds
+
+  ```swift
+  try await Mercato.beginRefundProcess(for: product, in: windowScene)
+  ```
+
+* Restore completed transactions
+
+  ```swift
+  try await Mercato.restorePurchases()
+  ```
+

README.md

@@ -85,7 +85,7 @@ do
 #### Purchase a product 
 
 ```swift
-try await Mercato.purchase(product: product, quantity: 1, atomically: false, appAccountToken: nil, simulatesAskToBuyInSandbox: false)
+try await Mercato.purchase(product: product, quantity: 1, finishAutomatically: false, appAccountToken: nil, simulatesAskToBuyInSandbox: false)
 ```
 
 #### Offering in-app refunds
@@ -103,6 +103,7 @@ try await Mercato.restorePurchases()
 ```
 
 ## Essential Reading
+
 * [Apple - Meet StoreKit 2](https://developer.apple.com/videos/play/wwdc2021/10114/)
 * [Apple - In-App Purchase](https://developer.apple.com/documentation/storekit/in-app_purchase)
 * [WWDC by Sundell - Working With In-App Purchases in StoreKit 2](https://wwdcbysundell.com/2021/working-with-in-app-purchases-in-storekit2/)

TODO.md

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+- [ ] Create example project based on Apple one
+- [ ] Get active subscription products
+- [ ] Download hosted content before finish transaction
+- [ ] Check whether product has an active subscription
+- [ ] Check whether product is refunded
+- [ ] Access unfinished transactions
+