chore: update readme

README.md

@@ -2,6 +2,34 @@
 
 This repository is a fork of [vuejs/core](https://github.com/vuejs/core) and is used for research and development of no virtual dom mode.
 
+## TODO
+
+PR are welcome! Please create a issue before you start to work on it.
+
+- [x] counter
+  - [x] simple bindings
+  - [x] simple events
+- [ ] TODO-MVC
+- [ ] directives
+  - [ ] `v-on`
+  - [ ] `v-bind`
+  - [ ] `v-model`
+  - [ ] `v-if` / `v-else` / `v-else-if`
+  - [ ] `v-for`
+  - [ ] `v-once`
+  - [ ] `v-html`
+  - [ ] `v-text`
+  - [ ] `v-show`
+  - [ ] `v-pre`
+  - [ ] `v-cloak`
+  - [ ] `v-memo`
+- [ ] Fragment
+- [ ] Remove DOM API in codegen
+- ...
+- [ ] SSR
+- [ ] Performance & Optimization
+  - [ ] remove unnecessary close tag `</div>`
+
 ## Sponsors
 
 Vue.js is an MIT-licensed open source project with its ongoing development made possible entirely by the support of these awesome [backers](https://github.com/vuejs/core/blob/main/BACKERS.md). If you'd like to join them, please consider [ sponsoring Vue's development](https://vuejs.org/sponsor/).