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README.md

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 ## C++ 
 
+- [nlohmann/json](https://github.com/nlohmann/json) - JSON for Modern C++
 - [OpenAtomFoundation/pika](https://github.com/OpenAtomFoundation/pika) - Pika is a NoSQL database compatible with redis which is developed by Qihoo's infrastructure team.
 - [chxuan/cpp-utils](https://github.com/chxuan/cpp-utils) - :hibiscus: 一些C/C++常用封装例子
 - [WasmEdge/WasmEdge](https://github.com/WasmEdge/WasmEdge) - WasmEdge is a lightweight, high-performance, and extensible WebAssembly runtime for cloud native, edge, and decentralized applications. It powers serverless apps, embedded functions, microservices, sm