Add a changelog

CHANGELOG.md

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+Changelog
+=========
+
+celutz-2.0.0 (unreleased)
+-------------------------
+
+  * New home for the project: <https://code.ffdn.org/FFDN/celutz>.
+  * First release with a brand new backend, completely rewritten in Django.
+  * Distances are now computed as straight-line distance, instead of
+    great-circle distance.  This should mostly matter for points that are
+    very close together, but with different altitudes.
+  * The URL of the panorama view acts as an auto-generated permalink
+    (à la openstreetmap.org).
+  * Existing panoramas can be used as reference points as well.
+  * Tile generation is now done in pure Python, instead of the existing shell
+    script that used Imagemagick's `convert` tool.
+
+The map (and related features) are not yet integrated in this new version.
+
+celutz-1.x
+----------
+
+Between March 2013 and February 2015, lots of improvements:
+
+  * Allow to calibrate the panorama directly from the web interface, by
+    simply clicking on the picture to add reference points.  This is done
+    with AJAX requests.
+  * Add a map displaying the panoramas.
+  * Allow to draw a line on the map by pointing at a direction in a panorama.
+    This can be very useful to pinpoint an unknown building in a picture,
+    because the line on the map gives a good indication of the location of
+    the building.
+  * Make the code less specific to tetaneutral.net.
+
+The code is available at <https://redmine.tetaneutral.net/projects/celutz>.
+
+29 March 2013: celutz-1.0
+-------------------------
+
+  * First public version of celutz, with a PHP backend and a Javascript interface.