add devcontainer

Author: Your Name

.devcontainer/Dockerfile

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+ARG DOTNET_VERSION
+ARG MAINTAINER
+ARG TZ
+FROM mcr.microsoft.com/dotnet/sdk:${DOTNET_VERSION} AS dotnet-maui-android
+
+LABEL maintainer=${MAINTAINER}
+ENV TZ=${TZ}
+ENV DOTNET_CLI_TELEMETRY_OPTOUT=1
+
+# JAVA
+ARG JAVA_VERSION
+RUN <<EOF
+  set -e
+  apt-get update
+  apt-get install -y openjdk-${JAVA_VERSION}-jdk-headless
+  rm -rf /var/lib/apt/lists/*
+EOF
+
+ENV JAVA_HOME=/usr/lib/jvm/java-${JAVA_VERSION}-openjdk-amd64/
+
+# Android SDK Manager
+RUN <<EOF
+  set -e
+  echo "deb http://deb.debian.org/debian bullseye-backports main contrib" > /etc/apt/sources.list.d/bullseye-backports.list
+  echo "deb-src http://deb.debian.org/debian bullseye-backports main contrib" >> /etc/apt/sources.list.d/bullseye-backports.list
+  apt-get update
+  apt-get install -t bullseye-backports -y sdkmanager
+  rm -rf /var/lib/apt/lists/*
+EOF
+
+ENV ANDROID_SDK_ROOT=/usr/lib/android-sdk
+
+# Android toolchain
+ARG ANDROID_API
+ARG BUILD_TOOLS_VERSION
+RUN <<EOF
+  set -e
+  sdkmanager "platform-tools" "build-tools;${BUILD_TOOLS_VERSION}" "platforms;android-${ANDROID_API}"
+EOF
+
+ARG MAUI_VERSION
+# MAUI (We can only install the latest version, the ARG is to cache bust if that version changed)
+RUN <<EOF
+  set -e
+  dotnet workload install maui-android
+EOF

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/dotnet
+{
+	"name": "C# (.NET)",
+	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+	// "image": "mcr.microsoft.com/devcontainers/dotnet:1-7.0-bookworm",
+	"build": {
+		"dockerfile": "Dockerfile",
+		"context": "..",
+		// Update 'VARIANT' to pick a dotnet version. Rebuild the container
+		"args": {
+			"TZ": "UTC",
+			// "MAUI_VERSION": "7.0.101",
+			"DOTNET_VERSION": "7.0",
+			"JAVA_VERSION": "11",
+			"ANDROID_API": "33",
+			"BUILD_TOOLS_VERSION": "33.0.2"
+		}
+	}
+
+	// "features": {
+	// 	"ghcr.io/nordcominc/devcontainer-features/android-sdk:1": {}
+	// }
+	
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {},
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [5000, 5001],
+	// "portsAttributes": {
+	//		"5001": {
+	//			"protocol": "https"
+	//		}
+	// }
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "dotnet restore",
+	// Configure tool-specific properties.
+	// "customizations": {},
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}