Finished adding basic category adding functionality

OpenArchival.Database/PostgresConnectionOptions.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OpenArchival.Database
+{
+    public class PostgresConnectionOptions
+    {
+        /// <summary>
+        /// The name of the configuration section for Postgres connection options.
+        /// </summary>
+        public static string Key = "PostgresConnectionOptions"; 
+        public string Host { get; set; } 
+        public int Port { get; set; } 
+        public string Database { get; set; } 
+        public string Username { get; set; } 
+        public string Password { get; set; } 
+        public string ConnectionString => $"Host={Host};Port={Port};Database={Database};Username={Username};Password={Password};";
+    }
+}