add extra reqs

docs/quickstart.md

@@ -9,9 +9,14 @@ jupytext:
 # Quickstart
 
 ## Installation
+To install the latest stable release from PyPI (recommended):
 ```bash
 pip install qubed
 ```
+Or to build and install the latest version from github (requires cargo):
+```bash
+pip install qubed@git+https://github.com/ecmwf/qubed.git@main
+```
 
 ## Usage
 Make an uncompressed qube:

pyproject.toml

@@ -18,9 +18,12 @@ requires-python = ">= 3.11"
 dynamic = ["version"]
 dependencies = [
     "frozendict",
-    "rich",
     "numpy",
+
+    # CLI
+    "rich",
     "click",
+    "psutil"
 ]
 
 # Because this is a mixed rust/python project the structure is src/python/qubed rather than the more typical src/qubed