chore: Create directories in the solution file

DentallApp.sln

@@ -11,10 +11,14 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DentallApp.Infrastructure",
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DentallApp.Shared", "src\Shared\DentallApp.Shared.csproj", "{F46CF4CF-269B-416C-B182-57ACBE30E009}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Tests", "Tests", "{053D7291-ED0F-415C-BCD9-17871520D348}"
+EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DentallApp.IntegrationTests", "tests\IntegrationTests\DentallApp.IntegrationTests.csproj", "{14FD4017-9906-4345-93B4-282B2E8D7968}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DentallApp.UnitTests", "tests\UnitTests\DentallApp.UnitTests.csproj", "{BE6318A1-900B-4E8E-8AAE-C391F881C844}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Plugins", "Plugins", "{30EF533B-8888-4B94-BEF9-BC8DE05FC667}"
+EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Plugin.AppointmentReminders", "src\Plugins\AppointmentReminders\Plugin.AppointmentReminders.csproj", "{EACB8B54-AAFE-4A46-A1D9-1FB23ADDA41C}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Plugin.ChatBot", "src\Plugins\ChatBot\Plugin.ChatBot.csproj", "{BFD8D9F8-AEF4-4661-B0DC-6D79F84F718E}"
@@ -96,6 +100,16 @@ Global
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
 	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+		{14FD4017-9906-4345-93B4-282B2E8D7968} = {053D7291-ED0F-415C-BCD9-17871520D348}
+		{BE6318A1-900B-4E8E-8AAE-C391F881C844} = {053D7291-ED0F-415C-BCD9-17871520D348}
+		{EACB8B54-AAFE-4A46-A1D9-1FB23ADDA41C} = {30EF533B-8888-4B94-BEF9-BC8DE05FC667}
+		{BFD8D9F8-AEF4-4661-B0DC-6D79F84F718E} = {30EF533B-8888-4B94-BEF9-BC8DE05FC667}
+		{3897DDB9-5C4F-4664-94D7-756A5E673951} = {053D7291-ED0F-415C-BCD9-17871520D348}
+		{6B8BD4C1-00A7-429B-A22F-25851E7296B5} = {30EF533B-8888-4B94-BEF9-BC8DE05FC667}
+		{6917AD6C-E337-4DE6-88D8-B0990E9B8D56} = {30EF533B-8888-4B94-BEF9-BC8DE05FC667}
+		{390B0477-73DB-4C71-A1BE-4539E93EF55D} = {30EF533B-8888-4B94-BEF9-BC8DE05FC667}
+	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {0D4387CF-90DE-4486-A988-CE52DFA1908A}
 	EndGlobalSection