update readme

README.md

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-# Usermanager written in Rust
+# Usermanager written in Rust
+
+> This project is **very much** work in progress. Do **absolutely not** use in production systems!
+
+What is working so far:
+  * Parsing:
+    * `/etc/passwd`
+    * `/etc/shadow` (root permission needed)
+    * `/etc/group` (not yet really assigned to the users)
+  * Modifying:
+    * delete a user
+    - [x] passwd
+    - [x] shadow
+    - [X] group
+        - [x] own group
+        - [ ] member
+    - [x] home dir
+        - [x] delete
+        - [x] keep
+        - [ ] archive
+    - [ ] mail?
+    - [ ] multiple entries "Multiple entries named '%s' in %s. Please fix this with pwck or grpck."
+    - [ ] cancel jobs:
+        - [ ] cron
+        - [ ] at
+        - [ ] print
+    * create a user
+        - [x] passwd
+        - [x] shadow
+        - [ ] group
+            - [ ] own group
+            - [ ] member
+        - [ ] home dir
+            - [ ] create from skeleton
+            - [ ] Skip
+            - [ ] create from directory
+        - [ ] mail?
+        - [ ] multiple entries (check uid duplication)