Set up ASP.NET Core Web API project structure

Initialized the ASP.NET Core application in `Program.cs` with
services for controllers, Swagger/OpenAPI, and middleware
for HTTPS redirection and authorization.

Added `launchSettings.json` to configure application launch
profiles for HTTP, HTTPS, and IIS Express environments.

Updated `ReC.API.csproj` to target .NET 8.0, enable nullable
reference types, and include the `Swashbuckle.AspNetCore`
package for Swagger support.

Added `appsettings.json` and `appsettings.Development.json`
for logging and environment-specific configurations.

Reorganized the solution structure in `ReC.sln` by moving
the `ReC.API` project under a `src` folder and updating
the `NestedProjects` section.

ReC.sln

@@ -1,9 +1,11 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
-VisualStudioVersion = 17.14.36717.8 d17.14
+VisualStudioVersion = 17.14.36717.8
 MinimumVisualStudioVersion = 10.0.40219.1
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ReC.API", "ReC.API\ReC.API.csproj", "{420218AD-3C27-4003-9A84-36C92352F175}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ReC.API", "src\ReC.API\ReC.API.csproj", "{420218AD-3C27-4003-9A84-36C92352F175}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{02EA681E-C7D8-13C7-8484-4AC65E1B71E8}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -19,6 +21,9 @@ Global
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
 	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+		{420218AD-3C27-4003-9A84-36C92352F175} = {02EA681E-C7D8-13C7-8484-4AC65E1B71E8}
+	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {F7B09104-4072-4635-9492-9C7C68D96ABD}
 	EndGlobalSection