Add 'Changelog'

Changelog.md

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+The file *debian/changelog* file documents in a short form all changes made to the package. This is not only useful for other developers, but also for normal users.
+
+# Format
+
+A normal changelog entry looks like:
+```
+super-package (0.13.0-0ubuntu5) eoan; urgency=medium
+
+  [ Minnie Mouse ]
+  * Add feature foo
+  * Refactor of lib bar:
+    - Use strategy pattern
+      + Added simple strategy
+      + Added normal strategy
+      + Added heavy strategy
+    - Better naming
+  [ Mickey Mouse ]
+  * Added unit tests
+
+ -- tricky-mickey <mickey@mouse.org>  Sun, 01 Apr 2019 11:17:17 +0200
+```
+
+  - Every line of the changelog entry should have a bullet point in front and in the order of `*`, `-`, `+`. If you need more levels, restart with the `*` bullet point.
+  - Use two spaces to indent.
+  - No trailing whitespaces.
+
+# debchange
+
+To edit the changelog, you can use the tool `debchange` from the package `devscripts`.
+
+| Command | Explanation |
+| ------------- | -------------- |
+| `dch -a`    | Append a new bullet point to the newest changelog entry |
+| `dch -i`     | Increment the version number: e.g `0.13.0-0ubuntu5 => 0.13.0-0ubuntu6` |
+| `dch --distribution=eoan` | Replace `UNRELEASED` with the specified distribution |
+| `dch -r ""` | Update the changelog timestamp |
+
+## Links
+
+  - [Debian manual](https://www.debian.org/doc/manuals/maint-guide/dreq.en.html#changelog)
+  - [Debian policy](https://www.debian.org/doc/debian-policy/ch-source.html#debian-changelog-debian-changelog)
+
+