add dev container

.devcontainer/Dockerfile

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+# Alpine Linux based dev container with build dependencies for 'cbmsrc' repository.
+# (See https://github.com/devcontainers/templates/tree/main/src/alpine)
+FROM mcr.microsoft.com/devcontainers/base:alpine
+
+# Install build dependencies for 'srecord'
+RUN apk add --no-cache \
+    boost-dev \
+    libtool \
+    libgcrypt-dev \
+    ghostscript \
+    groff
+
+# Build 'srecord' from source and install to '/usr/local/bin'
+RUN cd /tmp && \
+    wget https://sourceforge.net/projects/srecord/files/srecord/1.64/srecord-1.64.tar.gz && \
+    tar xf srecord-1.64.tar.gz && \
+    cd srecord-1.64 && \
+    ./configure && \
+    make -j$(nproc) && \
+    make install && \
+    cd /tmp && \
+    rm -rf srecord-1.64*
+
+# Build 'kernalemu' from source and install to '/opt/kernalemu/bin'
+RUN cd /tmp && \
+    git clone https://github.com/mist64/kernalemu.git && \
+    cd kernalemu && \
+    make -j$(nproc) && \
+    mkdir -p /opt/kernalemu/bin && \
+    cp build/kernalemu /opt/kernalemu/bin && \
+    cd /tmp && \
+    rm -rf kernalemu
+
+# Set 'KERNALEMU' environment variable to the path of the 'kernalemu' binary
+ENV KERNALEMU=/opt/kernalemu/bin/kernalemu
+
+# Build 'cbm6502asm' from source and install to '/opt/cbm6502asm/bin'
+RUN cd /tmp && \
+    git clone https://github.com/mist64/cbm6502asm.git && \
+    cd cbm6502asm && \
+    make -j$(nproc) && \
+    mkdir -p /opt/cbm6502asm/bin && \
+    cp build/asm /opt/cbm6502asm/bin && \
+    cd /tmp && \
+    rm -rf cbm6502asm
+
+# Set 'CBM6502ASM' environment variable to the path of the 'cbm6502asm' binary
+ENV CBM6502ASM=/opt/cbm6502asm/bin/asm
+
+# Download 'assembler64.prg' from the 'kernalemu' repository and copy to '/opt/assembler64'
+RUN mkdir -p /opt/assembler64 && \
+    cd /opt/assembler64 && \
+    wget https://github.com/mist64/kernalemu/raw/refs/heads/main/demo/assembler64.prg
+
+# Set 'ASSEMBLER64' environment variable to the path of the 'assembler64.prg' file
+ENV ASSEMBLER64=/opt/assembler64/assembler64.prg

.devcontainer/devcontainer.json

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+// Alpine Linux based dev container with build dependencies for 'cbmsrc' repository.
+// For format details, see https://aka.ms/devcontainer.json.
+{
+	"name": "cbmsrc",
+	"build": {
+        "dockerfile": "Dockerfile"
+    }
+}