Add README.python

README.python

+To enable HarfBuzz bindings for Python among other languages, make sure
+you have latest version of gobject-introspection compiled, and then
+run autogen.sh (if building from git), and then:
+
+  ./configure --with-gobject --enable-introspection
+
+Make sure that gobject-introspection is enabled then in the final report.
+
+Compile and install.
+
+Make sure you have the installation lib dir in LD_LIBRARY_PATH, as needed
+for the linker to find the library.
+
+Then make sure you also have GI_TYPELIB_PATH pointing to the resulting
+$prefix/lib/girepository-* directory.
+
+Make sure you have pygobject installed.  Then check that the following
+import works in your Python interpretter:
+
+  from gi.repository import HarfBuzz
+
+If it does, you are ready to call HarfBuzz from Python!  Congratulations.
+See src/sample.py.
+
+The Python API will change.  Let us know on the mailing list if you are
+using it, and send lots of feedback.