better pyvips8 notes

TODO

@@ -1,5 +1,3 @@
-- tests have stopped working with python2?
-
 - use vips_resize() in vipsthumbnail?
 
   should the sharpening filter be selectable?

python/README.md

@@ -1,8 +1,10 @@
 # vips8 binding for Python
 
 This overrides file adds a few small helper functions to the 
-gobject-introspection binding for libvips. It works with python2.7 and
+gobject-introspection binding for libvips. It has been tested with python2.7 
-python3.4.
+and python3.4 and may work for other versions. 
+
+## Documentation
 
 There's a chapter in the libvips API docs on these overrides, see "Using
 libvips from Python". 
@@ -10,7 +12,18 @@ libvips from Python".
 vips-x.y.z/test has a test suite. Again, the test suite works with python2.7
 and python3.4.
 
-Vips.py needs to be in the overrides directory of your gobject-introspection
+## Install
+
+`libvips` need to be built and installed. 
+
+The libvips typelib, `Vips-8.0.typelib`, needs to be on your `GI_TYPELIB_PATH`. It is typically installed somewhere like `/usr/local/lib/girepository-1.0`
+
+You need `pygobject-3.0`. To confirm that it's installed, check that your 
+Python `dist-packages` area has a directory called `gi`. For example:
+
+    ls /usr/lib/python2.7/dist-packages/gi
+
+`Vips.py` needs to be in the overrides directory of your gobject-introspection
 pygobject area, for example:
 
     sudo cp Vips.py /usr/lib/python2.7/dist-packages/gi/overrides
@@ -19,3 +32,11 @@ or
 
     sudo cp Vips.py /usr/lib/python3/dist-packages/gi/overrides
 
+You can optionally pre-compile this file for a small speedup.
+
+For python2.7, you need to install the "future" package. In Ubuntu, for
+example, you can do something like:
+
+    sudo apt-get install python-pip
+    sudo pip install future
+