dev: add cmake-workspace sample

editors/vscode/samples/cmake-workspace/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16)
+
+project(clice_vscode_cmake_sample LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(sample_greeting greeting.cc)
+target_include_directories(sample_greeting PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}")
+
+add_executable(sample_app main.cc)
+target_link_libraries(sample_app PRIVATE sample_greeting)

editors/vscode/samples/cmake-workspace/README.md

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+# VS Code CMake Sample
+
+This workspace is a standalone CMake project for attaching the VS Code extension to a real `clice` session.
+
+`clice` already auto-detects `build/compile_commands.json`, so this sample does not need any helper scripts or extra CMake glue.
+
+## Prepare The Workspace
+
+From this directory:
+
+```sh
+cmake -S . -B build -G Ninja -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
+```
+
+That is enough to generate `build/compile_commands.json`, which `clice` can discover automatically when this folder is opened as the workspace.
+
+If you also want the sample binary:
+
+```sh
+cmake --build build
+```

editors/vscode/samples/cmake-workspace/greeting.cc

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+#include "greeting.h"
+
+#include <string>
+
+std::string build_greeting(std::string_view name) {
+    return "Hello, " + std::string(name) + " from the CMake sample.";
+}

editors/vscode/samples/cmake-workspace/greeting.h

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+#pragma once
+
+#include <string>
+#include <string_view>
+
+std::string build_greeting(std::string_view name);

editors/vscode/samples/cmake-workspace/main.cc

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+#include "greeting.h"
+
+#include <iostream>
+
+int main() {
+    std::cout << build_greeting("clice") << '\n';
+    return 0;
+}