[sharedlibrary] add client meta

[application] add gravatar command

SharedLibraryCore/Database/Models/EFMeta.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Text;
+
+namespace SharedLibraryCore.Database.Models
+{
+    /// <summary>
+    /// This class encapsulates any meta fields as a simple string 
+    /// </summary>
+    public class EFMeta : SharedEntity
+    {
+        [Key]
+        public int MetaId { get; set; }
+        [Required]
+        public DateTime Created { get; set; } = DateTime.UtcNow;
+        [Required]
+        public DateTime Updated { get; set; } = DateTime.UtcNow;
+        [Required]
+        public int ClientId { get; set; }
+        [ForeignKey("ClientId")] // this is the client that the meta belongs to
+        public virtual EFClient Client { get; set; }
+        [Required]
+        [MinLength(3)]
+        public string Key { get; set; }
+        [Required]
+        public string Value { get; set; }
+        public string Extra { get; set; }
+    }
+}