add readme

README.md

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+# lumbung-theme
+
+A Hugo theme for lumbung.space
+
+### Installation
+
+`cd /my/hugosite/themes`
+`git clone https://git.vvvvvvaria.org/rra/lumbung-theme`
+
+edit `/my/hugosite/config.toml`:
+
+```
+cat config.toml 
+baseURL = "http://localhost/"
+languageCode = "en-us"
+title = "lumbung.space"
+theme = 'lumbung-theme'
+```