Revert "Add README file"
Fixes following CI failure:
dpkg-source: info: local changes detected, the modified files are:
source/README.md
dpkg-source: error: aborting due to unexpected upstream changes, see /tmp/ofono-ril-binder-plugin_1.2.6-0ubports4+0~20221207131659.1+ubports20.04~1.gbp0def85.diff.RstvLK
dpkg-source: info: you can integrate the local changes with dpkg-source --commit
dpkg-buildpackage: error: dpkg-source --unapply-patches -b . subprocess returned exit status 2
With the way Debian packaging work, one cannot just add a new file in the repo that doesn't exist in the orig tarball.
This reverts commit 0def852b