Added new API for getting Member (aka Users but for use in FE). User is just used for login/registering.

API/DTOs/MemberDto.cs

@@ -0,0 +1,16 @@
+using System;
+
+namespace API.DTOs
+{
+    /// <summary>
+    /// Represents a member of a Kavita server. 
+    /// </summary>
+    public class MemberDto
+    {
+        public int Id { get; set; }
+        public string Username { get; set; }
+        public DateTime Created { get; set; }
+        public DateTime LastActive { get; set; }
+        public bool IsAdmin { get; set; }
+    }
+}