Simplify the README and add changelog file

CHANGELOG.md

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+# Changelog
+
+> v0.6.0
+
+- Add progressive loading of images
+- Redesign image display
+- Clean up a bit the example website
+
+> v0.5.0
+
+- Add an automatic way to add sections
+- Add the possibility to add a header to a section list page
+- Add an automatic way to add single pages
+- Group blog articles by month and year
+- Add a homepage with the possibility of adding a small text and few articles
+- Update hightlightjs to v9.9.0
+- Few deletions of obsolete lines
+
+> v0.4.0
+
+- Add logo and a title in header instead of only the author name
+- Change pages from the navigation
+- Delete useless icons from the bottom
+- Change fonts and style the text (font size, justify ...)
+- Improve mobile design by adding dates, removing grey background and adapt font
+
+And more.
+
+> v0.3.0
+
+- Change color from orange to blue; improve colors elsewhere
+- Change `div.section` to `section`
+- Rename  `posts` directory to `blog`
+- Add ability to specify extra CSS files in `config.toml`
+- Removed `WebFontsFile` feature from `config.toml`
+- Remove the initials displayed on top right of single post pages
+- Update example site
+
+> v0.2.0
+
+* Added Disqus support. To enable Disqus, add `disqusshortname = "XYZ"` to `config.toml`. More details: <http://gohugo.io/extras/comments/>.
+* In the posts list, replaced date with bullets at smaller screen widths.
+
+> v0.1.0
+
+* Initial release