Add readme and license

pay_u/Cargo.toml

@@ -1,7 +1,9 @@
 [package]
 name = "pay_u"
+description = "PayU Rest API wrapper"
 version = "0.1.0"
 edition = "2021"
+license = "MIT"
 
 [dependencies]
 reqwest = { version = "0.11.10", features = ["default", "native-tls", "json"] }

pay_u/Readme.md

@@ -1,2 +1,53 @@
 # Payu REST API
 
+## Install
+
+```bash
+cargo add pay_u
+```
+
+## Usage
+
+```rust
+async fn usage() {
+    let client_id = std::env::var("PAYU_CLIENT_ID").unwrap();
+    let client_secret = std::env::var("PAYU_CLIENT_SECRET").unwrap();
+    let merchant_id = std::env::var("PAYU_CLIENT_MERCHANT_ID").unwrap().parse().unwrap();
+    let mut client = Client::new(client_id, client_secret, merchant_id);
+
+    let _res = client.create_order(
+        OrderCreateRequest::new(
+            Buyer::new("john.doe@example.com", "654111654", "John", "Doe", "pl"),
+            "127.0.0.1",
+            "PLN",
+        )
+            // Endpoint which will be requested by PayU with payment status update
+            .with_notify_url("https://your.eshop.com/notify")
+            // payment description (MANDATORY)
+            .with_description("RTV market")
+            // add list of products
+            .with_products(
+                [
+                    Product::new("Wireless Mouse for Laptop", 15000, 1),
+                    Product::new("HDMI cable", 6000, 1),
+                ]
+                    .into_iter(),
+            )
+            // add additional product
+            .with_product(Product::new("HDMI cable", 6000, 1)),
+    )
+        .await;
+    
+    let _res = client
+        .partial_refund(
+            "H9LL64F37H160126GUEST000P01",
+            RefundRequest::new("Refund", 1000),
+        )
+        .await;
+}
+```
+
+## Bugs
+
+Please report bugs here: https://todo.sr.ht/~tsumanu/payu-rs
+