add csharp snippets

snippets/csharp/LnurlPay.cs

@@ -0,0 +1,29 @@
+using Breez.Sdk;
+
+public class LnurlPaySnippets
+{
+    public void LnurlPay(BlockingBreezServices sdk)
+    {
+        // ANCHOR: lnurl-pay
+        // Endpoint can also be of the form:
+        // lnurlp://domain.com/lnurl-pay?key=val
+        // lnurl1dp68gurn8ghj7mr0vdskc6r0wd6z7mrww4excttsv9un7um9wdekjmmw84jxywf5x43rvv35xgmr2enrxanr2cfcvsmnwe3jxcukvde48qukgdec89snwde3vfjxvepjxpjnjvtpxd3kvdnxx5crxwpjvyunsephsz36jf
+        var lnurlPayUrl = "lightning@address.com";
+
+        try
+        {
+            var input = BreezSdkMethods.ParseInput(lnurlPayUrl);
+            if (input is InputType.LnUrlPay lnurlp)
+            {
+                var amountMsat = lnurlp.data.minSendable;
+                var result = sdk.PayLnurl(
+                    new LnUrlPayRequest(lnurlp.data, amountMsat, "comment"));
+            }
+        }
+        catch (Exception)
+        {
+            // Handle error
+        }
+        // ANCHOR_END: lnurl-pay
+    }
+}