adds features section to readme

README.md

 Change to Document Title Here
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+A flexible and future proof way to write documents.
+
+Features
+--------
+
+This project template and its build is quite flexible. The template strives to
+provide a more or less complete example of what is possible to keep not just
+the text under version control but also other sources like flowcharts and
+plots. Flexibility also means that you can add any feature you see fit or opt
+out of features you don't need.
+
+The default features include:
+
+- write document in [pandoc][]-flavored Markdown, the example sources include
+  - a Markdown guide
+  - how to use inline LaTeX
+  - how to insert tables from CSV files
+  - how to insert flowcharts generated via [Graphviz][] from `.dot` sources
+  - how to insert plots generated with [R][] from CSV sources
+- a build script (`Makefile`) to automate the build process
+- convert Markdown sources to PDF with [pandoc][]
+- continuous integration, i.e. a build server that automatically
+  - spell checks Markdown sources
+  - deploys document to [Nextcloud][idiv-nc] share
+
+### Disabling Features
+
+You can remove some features just by removing the respective content in the
+Markdown sources.
+
+-   **plots:** remove the `*.R` file(s) in `img/plot`
+-   **flowcharts:** remove the `*.dot` file(s) in `img/graph`
+
 Continuous Integration
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