add GITMOVE info

GITMOVE

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+We're moving pyechonest from SVN to git, and hosting it on Github.
+The old Google Code repository will be deprecated but otherwise 
+left alone for the short term, and we'll delete it eventually. 
+All history was maintained in the move.
+
+How to do a release:
+
+# first update the documentation submodule
+# this will update the gh-pages (pyechonest documentation) available at:
+# http://echonest.github.com/pyechonest/
+
+$ cd doc
+$ make html
+$ cd build/html
+$ git commit -a -m 'made some changes, yo'
+$ git push
+
+# then commit the rest of your changes from the root of the repo
+
+$ cd ../
+$ git commit -a -m 'made some changes, yo'
+$ git push
+
+# make a tag
+$ git tag -a 4.2.16 -m "4.2.16 tag with feature A feature B etc"
+$ git push --tags
+
+# create the zip and egg files
+$ ./mkrelease ~/
+# upload them to github