Add project files.

RHLauncher.Helper/IniFile.cs

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+using System.Runtime.InteropServices;
+using System.Text;
+
+namespace RHLauncher.RHLauncher.Helper
+{
+    public class IniFile
+    {
+        private readonly string _iniFilePath;
+
+        [DllImport("kernel32")]
+        private static extern long WritePrivateProfileString(string section, string key, string val, string filePath);
+
+        [DllImport("kernel32")]
+        private static extern int GetPrivateProfileString(string section, string key, string def, StringBuilder retVal, int size, string filePath);
+
+        public IniFile(string iniFileName)
+        {
+            string appDirectory = AppDomain.CurrentDomain.BaseDirectory;
+            _iniFilePath = Path.Combine(appDirectory, iniFileName);
+
+            if (!File.Exists(_iniFilePath))
+            {
+                //Default api url
+                WritePrivateProfileString("Info", "LoginURL", "http://localhost:3000", _iniFilePath);
+                //Default client service
+                WritePrivateProfileString("Info", "Service", "usa", _iniFilePath);
+            }
+        }
+
+        public string ReadValue(string section, string key)
+        {
+            StringBuilder sb = new(255);
+            GetPrivateProfileString(section, key, "", sb, 255, _iniFilePath);
+            return sb.ToString();
+        }
+
+        public void WriteValue(string section, string key, string value)
+        {
+            WritePrivateProfileString(section, key, value, _iniFilePath);
+        }
+    }
+}