Repo created

cli/html-cleaner-cli/README.md

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+```text
+Usage: html-cleaner [OPTIONS] INPUT [OUTPUT]
+
+  A tool that modifies HTML to only keep allowed elements and attributes the
+  same way that K-9 Mail does.
+
+Options:
+  -h, --help  Show this message and exit
+
+Arguments:
+  INPUT   HTML input file (needs to be UTF-8 encoded)
+  OUTPUT  Output file
+```
+
+You can run this tool using the [html-cleaner](../../html-cleaner) script in the root directory of this repository.
+It will compile the application and then run it using the given arguments. This allows you to make modifications to the
+[HTML cleaning code](../../app/html-cleaner/src/main/java/app/k9mail/html/cleaner) and test the changes right away.