Add project files.

MinecraftDiscordBot/Dockerfile

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+#See https://aka.ms/containerfastmode to understand how Visual Studio uses this Dockerfile to build your images for faster debugging.
+
+FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS base
+WORKDIR /app
+EXPOSE 80
+
+FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
+WORKDIR /src
+COPY ["MinecraftDiscordBot/MinecraftDiscordBot.csproj", "MinecraftDiscordBot/"]
+RUN dotnet restore "MinecraftDiscordBot/MinecraftDiscordBot.csproj"
+COPY . .
+WORKDIR "/src/MinecraftDiscordBot"
+RUN dotnet build "MinecraftDiscordBot.csproj" -c Release -o /app/build
+
+FROM build AS publish
+RUN dotnet publish "MinecraftDiscordBot.csproj" -c Release -o /app/publish
+
+FROM base AS final
+WORKDIR /app
+COPY --from=publish /app/publish .
+ENTRYPOINT ["dotnet", "MinecraftDiscordBot.dll"]