Proof Of Concept initial

Adds initial files for a proof-of-concept project, including Dockerfile, .gitignore, project files, and MQTT-related services.

This commit sets up the basic structure and configuration for exploring and validating the core concepts of the project.

Source/ProofOfConcept/Dockerfile

@@ -1,10 +1,10 @@
-FROM mcr.microsoft.com/dotnet/aspnet:10.0 AS base
+FROM mcr.microsoft.com/dotnet/aspnet:10.0-preview AS base
 USER $APP_UID
 WORKDIR /app
 EXPOSE 8080
 EXPOSE 8081
 
-FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
+FROM mcr.microsoft.com/dotnet/sdk:10.0-preview AS build
 ARG BUILD_CONFIGURATION=Release
 WORKDIR /src
 COPY ["ProofOfConcept/ProofOfConcept.csproj", "ProofOfConcept/"]