Initial sphinx-based documentation

docs/source/index.rst

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+PGPainless - Painless OpenPGP
+=============================
+
+**OpenPGP** (`RFC 4480 <https://datatracker.ietf.org/doc/rfc4880/>`_) is an Internet Standard mostly used for email encryption.
+It provides mechanisms to ensure *confidentiality*, *integrity* and *authenticity* of messages.
+However, OpenPGP can also be used for other purposes, such as secure messaging or as a signature mechanism for software distribution.
+
+**PGPainless** strives to improve the (currently pretty dire) state of the ecosystem of Java libraries and tooling for OpenPGP.
+
+The library focuses on being easy and intuitive to use without getting into your way.
+Common functions such as creating keys, encrypting data, and so on are implemented using a builder structure that guides you through the necessary steps.
+
+Internally, it is based on `Bouncy Castles <https://www.bouncycastle.org/java.html>`_ mighty, but low-level OpenPGP API.
+PGPainless' goal is to empower you to use OpenPGP without needing to write all the boilerplate code required by Bouncy Castle.
+It aims to be secure by default while allowing customization if required.
+
+
+Contents
+--------
+
+.. toctree::
+
+   quickstart.md
+   ecosystem.md
+   sop.md