initial commit. simple working hello world using capacitor framework.

.devcontainer/Dockerfile

@@ -0,0 +1,29 @@
+FROM node:24-trixie-slim
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    openjdk-21-jdk \
+    wget \
+    unzip \
+    git \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Set up Java environment
+ENV JAVA_HOME=/usr/lib/jvm/java-21-openjdk-amd64
+ENV PATH=${PATH}:${JAVA_HOME}/bin
+
+# Set up Android SDK
+ENV ANDROID_HOME=/opt/android-sdk
+ENV PATH=${PATH}:${ANDROID_HOME}/cmdline-tools/latest/bin:${ANDROID_HOME}/platform-tools:${ANDROID_HOME}/build-tools/36.0.0
+
+RUN mkdir -p ${ANDROID_HOME}/cmdline-tools \
+    && wget https://dl.google.com/android/repository/commandlinetools-linux-13114758_latest.zip -O commandlinetools.zip \
+    && unzip commandlinetools.zip -d ${ANDROID_HOME}/cmdline-tools \
+    && mv ${ANDROID_HOME}/cmdline-tools/cmdline-tools ${ANDROID_HOME}/cmdline-tools/latest \
+    && rm commandlinetools.zip && yes | sdkmanager --licenses \
+    && sdkmanager "platform-tools" "platforms;android-36" "build-tools;36.0.0" \
+    && chown -R node:node ${ANDROID_HOME}
+
+# Install Capacitor CLI globally
+RUN npm install -g @capacitor/cli