readme: update with install/usage info

README.md

@@ -1,8 +1,52 @@
 Scaruffi
 ========
 
-Get some data from scaruffi.com from Python. Work in progress (i.e. abandoned).
+Get some data from scaruffi.com from Python.
 
 Piero Scaruffi has written a lot about rock music, jazz, classical, whether it
 is reviews or history. It is a valuable ressource for a variety of reasons and
 this script aims to make data fetching easier for personal usage.
+
+
+
+Install
+-------
+
+This library is available on PyPI:
+
+```bash
+pip install scaruffi
+```
+
+
+
+Usage
+-----
+
+Check out the `ScaruffiApi` for all available methods.
+
+```python
+from scaruffi.api import ScaruffiApi
+api = ScaruffiApi()
+api.get_ratings(1960)
+# { 9.5: [ Release(title='Trout Mask Replica', ...
+```
+
+This module can also be used as a command-line tool:
+
+```bash
+scaruffi --help
+scaruffi --musicians --offset 5555 --limit 5
+# Mooseheart Faith
+# Morbid Angel
+# Morcheeba
+# Morgan Fisher
+# Morning 40 Federation
+scaruffi --ratings 1960
+# 9.5
+# - Captain Beefheart - Trout Mask Replica (1969)
+# 9.0
+# - Bob Dylan - Blonde On Blonde (1966)
+# - Captain Beefheart - Safe As Milk (1967)
+# ...
+```