Update README.md

Author: wyfcyx

README.md

@@ -18,9 +18,47 @@ This project aims to show how to write an **Unix-like OS** running on **RISC-V**
 * **only 4K+ LoC**
 * [A detailed documentation in Chinese](https://rcore-os.github.io/rCore-Tutorial-Book-v3/) in spite of the lack of comments in the code(English version is not available at present)
 
+## Run our project
+
+TODO:
+
 ## Working in progress
-* [ ] update Rust & RustSBI to latest version
-* [ ] rewrite practice doc and remove some inproper questions
+
+Now we are still updating our project, you can find latest changes on branches `chX-dev` such as `ch1-dev`. We are intended to publish first release 3.5.0 after completing most of the tasks mentioned below.
+
+### Completed
+
+* [x] automatically clean up and rebuild before running our project on a different platform
+* [x] fix `power` series application in early chapters, now you can find modulus in the output
+* [x] use `UPSafeCell` instead of `RefCell` or `spin::Mutex` in order to access static data structures(now ch4 completed)
+* [x] move `TaskContext` into `TaskControlBlock` instead of restoring it in place on kernel stack(since ch3), eliminating annoying `task_cx_ptr2`
+
+### Todo(High priority)
+
+* [ ] replace `llvm_asm!` with `asm!`
+* [ ] bug fix: we should call `find_pte` rather than `find_pte_create` in `PageTable::unmap`
 * [ ] add a new chapter about synchronization & mutual exclusion(up or smp?)
+
+### Todo(Low priority)
+
+* [ ] rewrite practice doc and remove some inproper questions
+* [ ] provide smooth debug experience at a Rust source code level
 * [ ] format the code using official tools
 * [ ] support Allwinner's RISC-V D1 chip
+
+## Dependency
+
+### Binaries
+
+* rustc: 1.55.0-nightly (2f391da2e 2021-07-14)
+
+* qemu: 5.0.0
+
+* rustsbi-lib: 0.2.0-alpha.4
+
+  rustsbi-qemu: d4968dd2
+
+  rustsbi-k210: b689314e
+### Crates
+
+We will add them later.