Add project files

StalwartSimpleLoginMiddleware/Utilities/ClaimsHelper.cs

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+using System.Security.Claims;
+using StalwartSimpleLoginMiddleware.Entities;
+
+namespace StalwartSimpleLoginMiddleware.Utilities;
+
+public static class ClaimsHelper
+{
+    public static List<Claim> BuildClaims(ApiKey apiKey)
+    {
+        var claims = new List<Claim>();
+
+        if (apiKey.IsAdmin)
+        {
+            claims.Add(new Claim(ClaimTypes.Role, "Admin"));
+        }
+
+        return claims;
+    }
+}