README : ajout to-do

README.md

@@ -2,5 +2,21 @@
 
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-(The only purpose of this is learning Rust!)
+## To-do
 
+- [x] Read commands from `stdin`
+- [ ] Exit with last child termination code
+- [ ] Handle background jobs
+- [ ] Handle pipes
+- [ ] Handle double quotes
+- [ ] Handle variables
+- [ ] Interaction with environment variables
+- [ ] Handle aliases
+- [ ] Builtins
+    - [ ] `cd`
+    - [ ] `exit`
+- [ ] Special variables
+    - [ ] `_`
+    - [ ] `PS1`
+    - [ ] Positional variables
+- [ ] Handle signals