Update README and add setup scripts

Dockerfile

@@ -0,0 +1,72 @@
+# Dockerfile for OpenWrt-Yocto Build Environment
+#
+# Yocto Project does NOT natively support macOS.
+# This Dockerfile provides an Ubuntu-based container with all
+# required build dependencies for Yocto/OpenEmbedded builds.
+#
+# Based on Yocto Project Scarthgap (5.0) system requirements:
+# https://docs.yoctoproject.org/ref-manual/system-requirements.html
+
+FROM ubuntu:24.04
+
+# Prevent interactive prompts during package installation
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install all required Yocto build host packages (from poky/documentation/poky.yaml.in)
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    chrpath \
+    cpio \
+    debianutils \
+    diffstat \
+    file \
+    gawk \
+    gcc \
+    git \
+    iputils-ping \
+    libacl1 \
+    liblz4-tool \
+    locales \
+    python3 \
+    python3-git \
+    python3-jinja2 \
+    python3-pexpect \
+    python3-pip \
+    python3-subunit \
+    socat \
+    texinfo \
+    unzip \
+    wget \
+    xz-utils \
+    zstd \
+    # Additional useful tools
+    sudo \
+    vim \
+    nano \
+    less \
+    bash-completion \
+    && rm -rf /var/lib/apt/lists/*
+
+# Set up locale (required by Yocto)
+RUN locale-gen en_US.UTF-8 && update-locale LANG=en_US.UTF-8
+ENV LANG=en_US.UTF-8
+ENV LC_ALL=en_US.UTF-8
+
+# Create a non-root user to match macOS host user (builds should not run as root)
+ARG USER_UID=1000
+ARG USER_GID=1000
+RUN groupadd -g ${USER_GID} builduser && \
+    useradd -m -u ${USER_UID} -g builduser -s /bin/bash builduser && \
+    echo "builduser ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers
+
+# Create working directory
+RUN mkdir -p /workspace && chown builduser:builduser /workspace
+
+# Switch to non-root user
+USER builduser
+WORKDIR /workspace
+
+# Set Git safe directory (since the mounted volume may have different ownership)
+RUN git config --global --add safe.directory /workspace
+
+ENTRYPOINT ["/bin/bash"]