fix: Add using directives so that docfx does not generate warnings

It is necessary to add the "using" explicitly in each file .cs so that docfx(v2.59.4) can recognize the types such as IEnumerable or ArgumentNullException.

Author: DevD4v3

src/Attributes/PluginAttribute.cs

@@ -1,4 +1,6 @@
-namespace CPlugin.Net;
+using System;
+
+namespace CPlugin.Net;
 
 /// <summary>
 /// This attribute is required so that the plugin loader can create the instance of the type that implements the contract.

src/Core/Configuration/CPluginConfigurationBase.cs

@@ -1,4 +1,8 @@
-namespace CPlugin.Net;
+using System;
+using System.Collections.Generic;
+using System.IO;
+
+namespace CPlugin.Net;
 
 /// <summary>
 /// Represents a configuration source to obtain the plugin files.

src/Core/Configuration/CPluginEnvConfiguration.cs

@@ -1,4 +1,8 @@
-namespace CPlugin.Net;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace CPlugin.Net;
 
 /// <summary>
 /// Represents a configuration to get the plugin files from an environment variable.

src/Core/Configuration/CPluginJsonConfiguration.cs

@@ -1,4 +1,7 @@
-using Microsoft.Extensions.Configuration;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Microsoft.Extensions.Configuration;
 
 namespace CPlugin.Net;
 

src/Core/PluginLoadContext.cs

@@ -1,4 +1,5 @@
-using System.Reflection;
+using System;
+using System.Reflection;
 using System.Runtime.Loader;
 
 namespace CPlugin.Net;

src/Core/PluginLoader.cs

@@ -1,4 +1,7 @@
-using System.Reflection;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
 
 namespace CPlugin.Net;