Initial

LightlessSyncServer/LightlessSyncShared/Services/IConfigurationService.cs

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+using LightlessSyncShared.Utils.Configuration;
+
+namespace LightlessSyncShared.Services;
+
+public interface IConfigurationService<T> where T : class, ILightlessConfiguration
+{
+    bool IsMain { get; }
+
+    event EventHandler ConfigChangedEvent;
+
+    T1 GetValue<T1>(string key);
+    T1 GetValueOrDefault<T1>(string key, T1 defaultValue);
+    string ToString();
+}