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README.md

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+# em_fmt 0.1.0
+
+`em_fmt` 是一个针对 C++23 的轻量级嵌入式友好格式化库实验，强调在编译期解析格式字符串并以极少依赖提供快速 `fprint` 输出接口。本次 0.1.0 版本主要聚焦于构建核心能力并提供示例和测试工程，便于继续迭代。
+
+## 特性
+- **编译期格式校验**：使用 `fixed_string` 在编译期解析格式字符串，提前检查花括号匹配与参数个数，让格式错误在编译阶段暴露。
+- **嵌入式可用的轻量实现**：完全头文件形式、仅依赖 C++23 标准库，无额外第三方依赖，在资源受限的嵌入式或交叉编译场景中也能轻松集成。
+- **广泛的参数支持**：当前支持整型、浮点、布尔、`std::string`、`std::string_view`、C 风格字符串以及原始指针和 `nullptr`。
+- **可配置的缓冲策略**：通过 `details/config.hpp` 切换静态缓冲区或栈上缓冲区，并支持选择浮点格式化方案，便于按需权衡性能与内存占用。
+- **极简构建依赖**：仅需 CMake 和支持 C++23 的编译器即可完成编译与测试，适合集成到现有构建流水线。
+
+## 快速开始
+1. 安装 C++23 编译器（如 GCC 13+ 或 Clang 16+）和 CMake 3.15 及以上版本。
+2. 在仓库根目录执行：
+   ```bash
+   cmake -S . -B build
+   cmake --build build
+   ctest --test-dir build
+   ```
+   `func_test` 将演示格式化输出，`speed_test` 用于性能基准。
+
+## 使用示例
+```cpp
+#include <em_fmt.hpp>
+
+int main() {
+    em::fprint<"answer={}, pi={}\n">(stdout, 42, 3.14);
+    return 0;
+}
+```
+
+## 配置项
+可编辑 `em_fmt/details/config.hpp` 调整以下选项：
+- `USE_STATIC_BUFFER` / `USE_STACK_BUFFER`：选择静态缓冲区或每次调用时的栈缓冲区。
+- `STATIC_BUFFER_SIZE` / `STACK_BUFFER_SIZE`：控制缓冲区大小。
+- `FLOAT_FORMAT_BY_STD_TO_CHAR` / `FLOAT_FORMAT_BY_STD_SNPRINTF`：选择浮点格式化方式。
+
+## 后续计划
+- 支持更多 STL 容器与自定义类型。
+- 提供可扩展的格式说明符。
+- 增加更多性能与正确性测试。
+
+欢迎提交 Issue 或 PR 共同完善！

README_en.md

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+# em_fmt 0.1.0
+
+`em_fmt` is an experimental, lightweight, and embedded-friendly formatting library for C++23. It performs compile-time parsing of format strings and keeps dependencies to a bare minimum while offering a fast `fprint` helper at runtime. Version 0.1.0 lays down the core infrastructure together with sample targets so future iterations can focus on feature growth.
+
+## Highlights
+- **Compile-time validation** – `fixed_string` analyses the format literal before compilation finishes, ensuring braces are balanced and argument counts match so mistakes surface during the build.
+- **Embedded-ready footprint** – header-only, relying solely on the C++23 standard library with no third-party dependencies, making it easy to drop into constrained or cross-compilation environments.
+- **Wide argument coverage** – integers, floating-point numbers, booleans, `std::string`, `std::string_view`, C-style strings, raw pointers, and `nullptr` are already supported.
+- **Configurable buffering** – tweak `details/config.hpp` to switch between static or stack-based buffers and to choose the floating-point formatting backend, helping balance performance and memory use.
+- **Minimal build requirements** – only CMake and a C++23-capable compiler are needed to build and test, easing integration into existing pipelines.
+
+## Getting started
+1. Install a C++23 capable toolchain (GCC 13+, Clang 16+, or MSVC with /std:c++latest) and CMake ≥ 3.15.
+2. Build and run the bundled tests:
+   ```bash
+   cmake -S . -B build
+   cmake --build build
+   ctest --test-dir build
+   ```
+   `func_test` demonstrates formatted output while `speed_test` is designed for benchmarking.
+
+## Usage example
+```cpp
+#include <em_fmt.hpp>
+
+int main() {
+    em::fprint<"answer={}, pi={}\n">(stdout, 42, 3.14);
+    return 0;
+}
+```
+
+## Configuration knobs
+Edit `em_fmt/details/config.hpp` to adjust:
+- `USE_STATIC_BUFFER` vs `USE_STACK_BUFFER` for buffer lifetime management.
+- `STATIC_BUFFER_SIZE` and `STACK_BUFFER_SIZE` for buffer sizing.
+- `FLOAT_FORMAT_BY_STD_TO_CHAR` vs `FLOAT_FORMAT_BY_STD_SNPRINTF` for floating-point formatting.
+
+## Roadmap
+- Extend support to additional STL containers and user-defined types.
+- Provide richer, customizable format specifiers.
+- Add more benchmarks and correctness suites.
+
+Contributions and feedback are very welcome!