Add chngelog generator basics

changelog/CHANGELOG.tmpl

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+{{- range $changes := . }}{{ with $changes -}}
+# Changelog for {{ .Version }}
+
+The following sections list the changes for {{ .Version }}.
+
+## Summary
+{{ range $entry := .Entries }}{{ with $entry }}
+ * {{ .TypeShort }} #{{ .PrimaryID }}: {{ .Title }}
+{{- end }}{{ end }}
+
+## Details
+{{ range $entry := .Entries }}{{ with $entry }}
+ * {{ .Type }} #{{ .PrimaryID }}: {{ .Title }}
+{{ range $par := .Paragraphs }}
+   {{ wrap $par 80 3 }}
+{{ end -}}
+{{ range $url := .IssueURLs }}
+   {{ $url -}}
+{{ end -}}
+{{ range $url := .PRURLs }}
+   {{ $url -}}
+{{ end -}}
+{{ range $url := .OtherURLs }}
+   {{ $url -}}
+{{ end }}
+{{ end }}{{ end }}
+
+{{ end }}{{ end -}}

changelog/README.md

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+# Changelog
+
+We are using [calens](https://github.com/restic/calens) to properly generate a
+changelog before we are tagging a new release. To update the changelog copy the
+files from the [unreleased](./unreleased) folder into a folder matching the
+schema `0.1.0_2019-09-01` to tag and execute `calens` in the root folder of the
+project.

changelog/TEMPLATE

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+Bugfix: Fix behavior for foobar (in present tense)
+
+We've fixed the behavior for foobar, a long-standing annoyance for users. The
+text should be wrapped at 80 characters length.
+
+The text in the paragraphs is written in past tense. The last section is a list
+of issue URLs, PR URLs and other URLs. The first issue ID (or the first PR ID,
+in case there aren't any issue links) is used as the primary ID.
+
+https://github.com/owncloud/reva-hyper/issues/1234
+https://github.com/owncloud/reva-hyper/pull/55555

changelog/unreleased/initial-release.md

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+Change: Initial release of basic version
+
+Just prepared an initial basic version which simply embeds the minimum of
+required services in the context of the ownCloud Infinite Scale project.
+
+https://github.com/owncloud/reva-hyper/issues/2