Update README

Author: matze

README.md

@@ -4,9 +4,11 @@
 manager. It adds three commands to work with currently selected files and
 symlinks:
 
+- `:annex_add` → `git annex add` + `git commit -a`
 - `:annex_get` → `git annex get`
 - `:annex_drop` → `git annex drop`
 - `:annex_copy <remote>` → `git annex copy --to=<remote>`
+- `:annex_sync` → `git annex sync --fast --quiet`
 
 You can move the `annex.py` manually to `$CONFIG_DIR/plugins` or run `make
 install`.