Add devcontainer for easier trying and contributing

.devcontainer/Dockerfile

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+FROM mcr.microsoft.com/devcontainers/base:ubuntu
+
+# Install Ubuntu packages
+RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+    && apt-get install -y \
+        build-essential=12.10ubuntu1 \
+        git=1:2.43.0-1ubuntu7.3 \
+        curl=8.5.0-2ubuntu10.6 \
+        pkg-config=1.8.1-2build1 \
+        unzip=6.0-28ubuntu4.1 \
+        make=4.3-4.1build2 \
+        wget=1.21.4-1ubuntu4.1 \
+        # --- OpenGL + X11 dependencies for GLEW + GLFW ---
+        libx11-dev=2:1.8.7-1build1 \
+        libxrandr-dev=2:1.5.2-2build1 \
+        libxinerama-dev=2:1.1.4-3build1 \
+        libxcursor-dev=1:1.2.1-1build1 \
+        libxi-dev=2:1.8.1-1build1 \
+        xorg-dev=1:7.7+23ubuntu3 \
+        libgl1-mesa-dev=25.0.7-0ubuntu0.24.04.2 \
+        libglu1-mesa-dev=9.0.2-1.1build1 \
+    && apt-get clean
+
+# Install CMake 4.0.2
+RUN mkdir -p /usr/local \
+    && cd /usr/local \
+    && wget https://github.com/Kitware/CMake/releases/download/v4.0.2/cmake-4.0.2-linux-x86_64.sh \
+    && chmod +x cmake-4.0.2-linux-x86_64.sh \
+    && ./cmake-4.0.2-linux-x86_64.sh --skip-license
+
+# Switch to vscode temporarily for installing vcpkg
+USER vscode
+
+RUN git clone https://github.com/microsoft/vcpkg.git /home/vscode/vcpkg \
+    && /home/vscode/vcpkg/bootstrap-vcpkg.sh -disableMetrics
+
+ENV VCPKG_ROOT=/home/vscode/vcpkg
+ENV PATH="${VCPKG_ROOT}:${PATH}"

.devcontainer/devcontainer.json

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+{
+  "name": "C++ Dev with vcpkg",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "ms-vscode.cpptools",
+        "ms-vscode.cmake-tools",
+        "ms-vscode.makefile-tools"
+      ]
+    }
+  },
+  "remoteUser": "vscode",
+  "runArgs": [
+    "--gpus=all",
+    "--device=/dev/dri:/dev/dri",
+    "--env=DISPLAY",
+    "--env=LIBGL_ALWAYS_INDIRECT=0",
+    "--volume=/tmp/.X11-unix:/tmp/.X11-unix"
+]
+}