Add changelog

commits for "config" and and "package" seem kind of similar, maybe we should merge these, what do you think?
also it would be nice if we could agree on some naming rules for commits. for example changes for feed packages_berlin should be prefixed with "feeds" sometimes it is prefixed "packages" which is confusing. 
i think a commit that adds or removes packages to our firmware should be prefixed with "packages" (or maybe "config" idk what is preferable)