Azure Function using C# instead of csx

[anandsowm]

For those who would like to do Home realm discovery using Azure Function, the run.csx provided in the project is based on c# script, if you wish to do it in C#, below is the equivalent code.

`` public static class HRD_Detect
{
[FunctionName("GetIdProvider")]
public static async Task Run(
[HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequest req,
ILogger log)
{
log.LogInformation("IdP selection received a request.");

        string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
        dynamic reqdata = JsonConvert.DeserializeObject(requestBody);

        log.LogInformation($"request  : {reqdata}");
        if (reqdata.emailAddress == null)
        {
            log.LogInformation($"Empty request, email was null");
            return new OkResult();
        }

        var email = ((string)reqdata.emailAddress).ToLower();
        log.LogInformation($"email: {email}");
        char splitter = '@';
        string[] splitEmail = email.Split(splitter);
        var emailSuffix = splitEmail[1];
        if (email == "bar@foo.com")
        {
            log.LogInformation($"Identity Provider: aad");
            return new OkObjectResult(
                new ResponseContent
                {
                    version = "1.0.0",
                    status = (int)HttpStatusCode.OK,
                    userMessage = $"Your account is a generic Azure AD account.",
                    idp = "aad",
                    signInName = email
                });
        }

        //For B2C local accounts
        if (email == "foo@bar.com")
        {
            log.LogInformation($"Identity Provider: local");
            return new OkObjectResult(
                new ResponseContent
                {
                    version = "1.0.0",
                    status = (int)HttpStatusCode.OK,
                    userMessage = $"Your account seems to be a local account.",
                    idp = "local",
                    signInName = email
                });
        }

        //For Contoso AAD accounts
        if (emailSuffix == "contoso.com")
        {
            log.LogInformation($"Identity Provider: contoso");
            return new OkObjectResult(

                new ResponseContent
                {
                    version = "1.0.0",
                    status = (int)HttpStatusCode.OK,
                    userMessage = $"Your account belongs to the contoso Identity Provider",
                    idp = "contoso",
                    signInName = email
                });
        }
        else
        {
            log.LogInformation($"Identity Provider: none");
            return new OkObjectResult(
                new BlankContent
                {
                    status = (int)HttpStatusCode.OK,
                    signInName = email
                });
                
        }
        //return new OkResult();
    }

}

//Default responses where there is no match
public class BlankContent
{
    public int status { get; set; }
    public string signInName { get; set; }
}

//For responses where there is an IdP matching
public class ResponseContent
{
    public string version { get; set; }
    public int status { get; set; }
    public string userMessage { get; set; }
    public string idp { get; set; }
    public string signInName { get; set; }
}

}
``