Add a CHANGELOG

CHANGELOG.rst

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+Changelog
+==============
+
+version 0.4.0 [future]
+-----------------------
+
+  - Refactor kitty's internals to make it even faster and more efficient. The
+    CPU usage of kitty + X server while doing intensive tasks such as scrolling
+    a file continuously in less has been reduced by 50%. There are now two
+    configuration options ``repaint_delay`` and ``input_delay`` you can use to
+    fine tune kitty's performance vs CPU usage profile. The CPU usage of kitty
+    + X when scrolling in less is now better than most (all?) other terminals.
+
+  - Hovering over URLs with the mouse now underlines them to indicate they
+    can be clicked. Hold down Ctrl+Shift while clicking to open the URL.
+
+  - Selection using the mouse is now more intelligent. It does not add
+    blank cells (i.e. cells that have no content) after the end of text in a
+    line to the selection.
+
+  - The block cursor in now fully opaque but renders the character under it in
+    the background color, for enhanced visibility.