Theme configuration

lib/constants/enums.dart

@@ -1,3 +1,5 @@
 enum LoadStatus { loading, loaded, error }
 
 enum ConnectionMethod { http, https }
+
+enum SelectedTheme { system, light, dark }

lib/constants/shared_preferences_keys.dart

@@ -0,0 +1,6 @@
+class SharedPreferencesKeys {
+  static const serversInstances = "serversInstances";
+  static const selectedTheme = "selectedTheme";
+  static const useDynamicTheme = "useDynamicTheme";
+  static const selectedColor = "selectedColor";
+}

lib/constants/strings.dart

@@ -0,0 +1,3 @@
+class Strings {
+  static const createdBy = "JGeek00";
+}

lib/constants/urls.dart

@@ -1,4 +1,5 @@
 class Urls {
   static const linkdingInstallationInstructions =
       "https://github.com/sissbruecker/linkding?tab=readme-ov-file#installation";
+  static const gitHubRepo = "https://github.com/JGeek00/linkdy";
 }