add readme

README.rst

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+==============================================================
+siibra - Software interface for interacting with brain atlases
+==============================================================
+
+Copyright 2020-2024, Forschungszentrum Jülich GmbH
+
+*Authors: Big Data Analytics Group, Institute of Neuroscience and
+Medicine (INM-1), Forschungszentrum Jülich GmbH*
+
+This repository contains the default configuration of `siibra-python <https://github.com/FZJ-INM1-BDA/siibra-python>`.
+
+Tag scheme
+==========
+Given a tag siibra-MAJOR.MINOR.PATCH, increments imply:
+   - MAJOR: incompatible API changes
+   - MINOR: a functionality in a backward compatible manner is added
+   - PATCH: backward compatible bug fixes and new configuration added such as new maps or features
+
+Pre-release
+-----------
+For x.y.z, a full release,
+- `x.y.z-alpha.t` is the development prerelease. By changing `t`, different siibra-configurations are targeted.