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dired-auto-readme
An Emacs package to automatically display a README file when one is present in a dired buffer.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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peep-dired
Discontinued A convienent way to look up file contents in other window while browsing directory in dired
Anyway, you can see my dired setup here: https://github.com/amno1/.emacs.d
If you find yourself in need of combining major modes, current way of doing it is either via org-mode (literal programming) or with polymode. I don't know of better way.
You man also check peep-dired which does similar. You could adapt it to show only readme files.