Update NuGet source to v3, add solution items

ImageProcessor.sln

@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 15
-VisualStudioVersion = 15.0.27130.2026
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.30011.22
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Plugins", "Plugins", "{5368AF57-74ED-4499-BCCD-38BCB18C4629}"
 EndProject
@@ -34,13 +34,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Build", "Build", "{4E1AB050
 		build\build.ps1 = build\build.ps1
 	EndProjectSection
 EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Readme", "Readme", "{1F68939E-8BBE-4D09-98B5-68B06BBDE68E}"
-	ProjectSection(SolutionItems) = preProject
-		LICENSE = LICENSE
-		README.md = README.md
-	EndProjectSection
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Nuspecs", "Nuspecs", "{E0B81C77-6E29-4500-9E9F-F0B72EBE8241}"
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "NuSpecs", "NuSpecs", "{E0B81C77-6E29-4500-9E9F-F0B72EBE8241}"
 	ProjectSection(SolutionItems) = preProject
 		build\NuSpecs\ImageProcessor.nuspec = build\NuSpecs\ImageProcessor.nuspec
 		build\NuSpecs\ImageProcessor.Plugins.Cair.nuspec = build\NuSpecs\ImageProcessor.Plugins.Cair.nuspec
@@ -81,6 +75,16 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "ImageProcessor.Web.Plugins.
 		build\content\ImageProcessor.Web.Plugins.AmazonS3Cache\config\imageprocessor\cache.config.transform = build\content\ImageProcessor.Web.Plugins.AmazonS3Cache\config\imageprocessor\cache.config.transform
 	EndProjectSection
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{57BBD0FE-E8BB-45EF-B7EE-EB7669192D0D}"
+	ProjectSection(SolutionItems) = preProject
+		.editorconfig = .editorconfig
+		.gitattributes = .gitattributes
+		.gitignore = .gitignore
+		LICENSE = LICENSE
+		NuGet.config = NuGet.config
+		README.md = README.md
+	EndProjectSection
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		All|Any CPU = All|Any CPU
@@ -167,6 +171,7 @@ Global
 		{633B1C4C-4823-47BE-9A01-A665F3118C8C} = {0E113662-D6E2-473E-92BA-6005EB412C00}
 		{ADAF0E0D-0CE9-45C2-AF95-70443273C468} = {0E113662-D6E2-473E-92BA-6005EB412C00}
 		{7BF5274B-56A7-4B62-8105-E9BDF25BAFE7} = {0E113662-D6E2-473E-92BA-6005EB412C00}
+		{4E1AB050-8CC4-4099-80AF-7FF2BFC000E9} = {57BBD0FE-E8BB-45EF-B7EE-EB7669192D0D}
 		{E0B81C77-6E29-4500-9E9F-F0B72EBE8241} = {4E1AB050-8CC4-4099-80AF-7FF2BFC000E9}
 		{A74AE40C-5374-4B15-BEBF-94D74C16AC3A} = {0E113662-D6E2-473E-92BA-6005EB412C00}
 		{19517DBA-58AA-4294-97BF-0D02902749B4} = {4E1AB050-8CC4-4099-80AF-7FF2BFC000E9}

Nuget.config → NuGet.config

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <configuration>
   <packageSources>
-    <add key="nuget.org" value="https://www.nuget.org/api/v2/" />
+    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
   </packageSources>
 </configuration>