Implement all functions from the Electron App-API

ElectronNET.API/Entities/MemoryInfo.cs

@@ -0,0 +1,33 @@
+namespace ElectronNET.API.Entities
+{
+    public class MemoryInfo
+    {
+        /// <summary>
+        /// The maximum amount of memory that has ever been pinned to actual physical RAM. 
+        /// On macOS its value will always be 0.
+        /// </summary>
+        public int PeakWorkingSetSize { get; set; }
+
+        /// <summary>
+        /// Process id of the process.
+        /// </summary>
+        public int Pid { get; set; }
+
+        /// <summary>
+        /// The amount of memory not shared by other processes, such as JS heap or HTML
+        /// content.
+        /// </summary>
+        public int PrivateBytes { get; set; }
+
+        /// <summary>
+        /// The amount of memory shared between processes, typically memory consumed by the 
+        /// Electron code itself
+        /// </summary>
+        public int SharedBytes { get; set; }
+
+        /// <summary>
+        /// The amount of memory currently pinned to actual physical RAM.
+        /// </summary>
+        public int WorkingSetSize {get; set; }
+    }
+}