add post archive

post_archive/README.md

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+# Post Archive in Hugo
+
+## Install
+
+1. Add the shortcode file `shortcodes/archive.html` to your project > `layouts/shortcodes`
+2. Add `content/archive.md` to your project's `/content` directory 
+
+## Usage
+
+To reach your Archive you can add a new menu entry that links to it:
+
+```toml
+[menu]
+    [[menu.main]]
+        identifier = "about"
+        name = "About"
+        url = "/about/"
+```
+
+Add a summary (description) to each Post:
+```yaml
++++
+...
+summary = "This is a Test Page for this Usage example"
+...
++++
+``` 
+
+## Preview
+
+![Highlight Boxes in Hugo](post_archive.png)

post_archive/content/archive.md

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++++
+title = "Archives"
+summary = "All my Posts ordered by their publication date."
+draft = false
++++
+
+{{% archive %}}

post_archive/shortcodes/archive.html

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+{{ $prev := 3000}}
+{{range where .Site.RegularPages "Section" "posts"}}
+{{if .Date}}
+{{if gt $prev (.Date.Format "2006")}}
+## {{ .Date.Format "2006" }}
+{{end}}
+{{.Date.Format "02. Jan"}} -- [{{.Title}}]({{.Permalink}})
+
+    <div class="post-summary">
+
+    {{.Summary}}
+
+    </div>
+
+{{ $prev = .Date.Format "2006"}}
+{{end}}
+{{end}}