Adding upstream version 1.4.2.

Signed-off-by: Daniel Baumann <daniel@debian.org>

README.md

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+# DSC DataTool
+
+[![Total alerts](https://img.shields.io/lgtm/alerts/g/DNS-OARC/dsc-datatool.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/DNS-OARC/dsc-datatool/alerts/) [![Bugs](https://sonarcloud.io/api/project_badges/measure?project=dns-oarc%3Adsc-datatool&metric=bugs)](https://sonarcloud.io/dashboard?id=dns-oarc%3Adsc-datatool) [![Security Rating](https://sonarcloud.io/api/project_badges/measure?project=dns-oarc%3Adsc-datatool&metric=security_rating)](https://sonarcloud.io/dashboard?id=dns-oarc%3Adsc-datatool)
+
+Tool for converting, exporting, merging and transforming DSC data.
+
+Please have a look at the man-page(s) `dsc-datatool` (1) on how to use or
+[the wiki article](https://github.com/DNS-OARC/dsc-datatool/wiki/Setting-up-a-test-Grafana)
+on how to set this up using Influx DB and Grafana.
+
+More information about DSC may be found here:
+- https://www.dns-oarc.net/tools/dsc
+- https://www.dns-oarc.net/oarc/data/dsc
+
+Issues should be reported here:
+- https://github.com/DNS-OARC/dsc-datatool/issues
+
+General support and discussion:
+- Mattermost: https://chat.dns-oarc.net/community/channels/oarc-software
+- mailing-list: https://lists.dns-oarc.net/mailman/listinfo/dsc
+
+## Dependencies
+
+`dsc-datatool` requires the following Python libraries:
+- PyYAML
+- maxminddb
+
+## Python Development Environment
+
+Using Ubuntu/Debian:
+
+```
+sudo apt-get install python3-maxminddb python3-yaml python3-venv
+python3 -m venv venv --system-site-packages
+. venv/bin/activate
+pip install -e . --no-deps
+```