Add README

README.md

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+# CAcert Web Resources
+
+This repository contains a set of assets (icons, logos, CSS theme) that can be
+used for CAcert specific web applications.
+
+The code in this repository is licensed under the terms of the Apache License
+Version 2.0.
+
+Copyright © 2020, 2021  Jan Dittberner
+
+## Build
+
+The resources are built using [webpack 5](https://webpack.js.org/) and
+[yarn](https://classic.yarnpkg.com/lang/en/). You need recent nodejs and yarn
+versions. See the [Debian installation
+instructions](https://github.com/nodesource/distributions/blob/master/README.md#debinstall)
+of nodesource or look at the other options on the [nodejs Download
+page](https://nodejs.org/en/download/) if you cannot use Debian Bullseye or
+newer.
+
+When you are sure that you have nodejs >= 12 and yarn you can install the
+required dependencies and run webpack like this:
+
+```
+yarn
+yarn run build
+```