update README.md

1. add todo
2. add plan

Author: techzealot

README.md

@@ -1,17 +1,56 @@
 # git-rust
-a minimal git implementation by rust
+a toy git implementation by rust
 
 ```shell
 usage:
 
-tit init|clone|add|stash|reset|rebase|commit|push|pull|merge|status|log
+tit <subcommand>
 ```
+porcelain:
+
+v0.1
+
+- [ ] init
+- [ ] add
+- [ ] commit
+- [ ] status
+- [ ] clone
+
+v0.2
+- [ ] branch
+- [ ] checkout
+- [ ] merge
+- [ ] rebase
+- [ ] reset
+- [ ] stash
+- [ ] revert
+
+v0.3
+- [ ] tag
+- [ ] diff
+- [ ] show
+- [ ] log
+- [ ] push
+- [ ] remote
+- [ ] rm
+- [ ] cherry-pick
+
+plumbing:
+
+- [ ] hash-object
+- [ ] cat-file
+- [ ] update-index
+- [ ] write-tree
+- [ ] read-tree
+- [ ] commit-tree
 
 todo:
 
 - [ ] autocomplete
 - [ ] man use build.rs
-- [ ] ci tests
+- [ ] ci tests (cli,completion,more)
+- [ ] signals handle,exitcode,interactive with machine and human
+- [ ] explore justfile as exa
 
 reference: