增加github oauth登录

src/Admin/ThingsGateway.Admin.Application/OAuth/OAuthUserExtensions.cs

@@ -0,0 +1,11 @@
+using System.Text.Json;
+
+namespace ThingsGateway.Admin.Application;
+
+public static class OAuthUserExtensions
+{
+    public static string TryGetValue(this JsonElement.ObjectEnumerator target, string propertyName)
+    {
+        return target.FirstOrDefault<JsonProperty>((Func<JsonProperty, bool>)(t => t.Name.Equals(propertyName, StringComparison.OrdinalIgnoreCase))).Value.ToString() ?? string.Empty;
+    }
+}