add changelog

CHANGELOG.md

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+# draft-dejong-remotestorage-03.txt
+
+## Breaking for servers as well as clients:
+* The content-type for folder listings was corrected to application/ld+json
+* The version string in the webfinger announcement was updated from -02 to -03
+
+## Breaking for servers:
+* Serving folder listings with zero items is no longer allowed; serve a 404 instead.
+* Servers MUST now comply with all of HTTP/1.1, including chunked uploads
+
+## Breaking for clients:
+* Servers MAY now expire access tokens, in line with the OAuth spec.
+
+## non-breaking:
+* The option to offer a manual way to create access tokens is now mentioned
+* The fact that strong ETags make gzipping impossible is now mentioned
+* Several small changes to clarify and correct the spec text
+* A build script and this changelog were added to the git repo on github.