Add CHANGELOG.md

CHANGELOG.md

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+Release notes
+=============
+
+This document describes all the changes made to the *Institutions API*
+document, starting from its first beta draft version.
+
+
+1.0.0-rc3
+---------
+
+* Now this API is serving references to other LOS types too (not only
+  `Course`s).
+
+
+1.0.0-rc2
+---------
+
+ * The `<response>` element has been renamed to
+   `<course-replication-response>`.
+
+
+1.0.0-rc1
+---------
+
+Initial release. (Since this API seemed really simple, we skipped the `0.x.y`
+versions altogether.)