doc: add new doc

Byte-OS · Jun 16, 2024 · 6b9d69d · 6b9d69d
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+# For Async Runtime Design
+
+> This is a design for async runtime.
+
+Design a TrapFrom::into_user() Then it will save the registers and use the pointer.
+
+Make a struct ThreadToken to pointer the original sp that contains the registers.
+
+Add a ThreadToken::restore() method to the original position, and it can return the custom value to the original position.