[Eplankton]

The original document is written in Chinese so far, and I'll release an English version with further development. But the major recognizable difference is the RAII-wrapper for many synchronous primitives like mutex/semaphore/message queue/spin-lock, also I've been trying to add async programming mechanism that is similar to those in Rust by taking advantage of C++20 coroutines, including an trivial implementation of future<T> that needs no dynamic allocation(which is crucial in embedded system context).