i created setting.cs file and wrote this

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Net;
using System.Reflection;
using System.Security.Cryptography;
using System.Threading;
using PokemonGo.RocketAPI;
using PokemonGo.RocketAPI.Enums;
using POGOProtos.Enums;
using POGOProtos.Inventory.Item;

namespace PoTestLogin
{
    class Settings : ISettings
    {
        public AuthType AuthType;
        public string googleUsername;
        public string googlePassword;
        public string PtcUsername;
        public string PtcPassword;
        public double lat;
        public double lon;
        public double Alti;
        public String googleRefreshToken;
        public string deviceId;
        public string androidBoardName;
        public string androidBootloader;
        public string deviceBrand;
        public string deviceModel;
        public string deviceModelIdentifier;
        public string deviceModelBoot;
        public string hardwareManufacturer;
        public string hardwareModel;
        public string firmwareBrand;
        public string firmwareTags;
        public string firmwareType;
        public string firmwareFingerprint;





        AuthType ISettings.AuthType
        {
            get
            {
                return AuthType;
            }

            set
            {
               AuthType = AuthType.Ptc;
            }
        }

        public double DefaultLatitude
        {
            get { return lat; }
            set {  lat = 40.767445685; }
        }

        public double DefaultLongitude
        {
            get
            {
                return lon;
            }

            set
            {
                lon = -73.970697559;
            }
        }

        public double DefaultAltitude
        {
            get
            {
                return Alti;
            }

            set
            {
                Alti  = 10;
            }
        }

        public string GoogleRefreshToken
        {
            get
            {
                return googleRefreshToken;
            }

            set
            {
                googleRefreshToken = "";
            }
        }

        string ISettings.PtcPassword
        {
            get
            {
                return PtcPassword;
            }

            set
            {
                PtcPassword = "rohan8806";
            }
        }

        string ISettings.PtcUsername
        {
            get
            {
                return PtcUsername;
            }

            set
            {
                PtcUsername = "Pokedex_Full";
            }
        }

        string ISettings.GoogleUsername
        {
            get
            {
                return googleUsername;
            }

            set
            {
                googleUsername = "";
            }
        }

        string ISettings.GooglePassword
        {
            get
            {
                return googlePassword;
            }

            set
            {
                googlePassword = "";
            }
        }

        public string DeviceId
        {
            get
            {
                return deviceId;
            }

            set
            {
                deviceId = "8525f6d8251f71b7";
            }
        }

        public string AndroidBoardName
        {
            get
            {
                return androidBoardName;
            }

            set
            {
                androidBoardName = "msm8994";
            }
        }

        public string AndroidBootloader
        {
            get
            {
                return androidBootloader ;
            }

            set
            {
                androidBootloader = "unknown";
            }
        }

        public string DeviceBrand
        {
            get
            {
                return deviceBrand;
            }

            set
            {
                deviceBrand = "OnePlus";
            }
        }

        public string DeviceModel
        {
            get
            {
                return deviceModel;
            }

            set
            {
                deviceModel = "OnePlus2";
            }
        }

        public string DeviceModelIdentifier
        {
            get
            {
                return deviceModelIdentifier;
            }

            set
            {
                deviceModelIdentifier = "ONE A2003_24_160604";
            }
        }

        public string DeviceModelBoot
        {
            get
            {
                return deviceModelBoot;
            }

            set
            {
                deviceModelBoot = "qcom";
            }
        }

        public string HardwareManufacturer
        {
            get
            {
                return hardwareManufacturer;
            }

            set
            {
                hardwareManufacturer = "OnePlus";
            }
        }

        public string HardwareModel
        {
            get
            {
                return hardwareModel;
            }

            set
            {
                hardwareModel = "ONE A2003";
            }
        }

        public string FirmwareBrand
        {
            get
            {
                return firmwareBrand;
            }

            set
            {
                firmwareBrand = "OnePlus2";
            }
        }

        public string FirmwareTags
        {
            get
            {
                return firmwareTags;
            }

            set
            {
                firmwareTags = "dev-keys";
            }
        }

        public string FirmwareType
        {
            get
            {
                return firmwareType;
            }

            set
            {
                firmwareType = "user";
            }
        }

        public string FirmwareFingerprint
        {
            get
            {
                return firmwareFingerprint;
            }

            set
            {
                firmwareFingerprint = "OnePlus/OnePlus2/OnePlus2:6.0.1/MMB29M/1447840820:user/release-keys";
            }
        }

    }

}