Added themes

DiscordBotUI/Theming/Theme.cs

@@ -0,0 +1,20 @@
+using System.Text.Json.Serialization;
+
+namespace DiscordBotUI_Windows.Theming
+{
+    internal class Theme 
+    {
+        public string Name { get; set; }
+        public string Description { get; set; }
+        public ThemeType Type { get; set; }
+        public IDictionary<string, string> ThemeValues { get; set; }
+
+        internal void SetThemeValue(string key, string value)
+        {
+            if (ThemeValues.ContainsKey(key))
+            {
+                ThemeValues[key] = value;
+            }
+        }
+    }
+}