Added CHANGELOG file

CHANGELOG.md

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+#**CHANGELOG**#
+
+#### Version 0.5.91 Alpha
+
+* fix #54, dock is shown when applet needs attention
+* fix #65, stop bouncing animation in hidden state
+* fix #66, many automatic size issues
+* fix #51, protect add task animation more
+* The task tooltip now shows all the borders
+* INSTALLATION file added with instructions for Kubuntu
+* Update README.md
+* Added rpm package for openSUSE
+* Added spanish translation
+* Translation strings improved #70
+
+#### Version 0.5.90 Alpha
+
+* First released