Add SSP_dark.svg; Change Readme format to markdown

Author: NikolaiFa

README.adoc

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+  <source media="(prefers-color-scheme: dark)" srcset="docs/images/SSP_dark.svg" style="width:70%;">
+  <source media="(prefers-color-scheme: light)" srcset="docs/images/SSP.svg" style="width:70%;">
+  <img alt="System Structure and Parameterization" src="docs/images/SSP.svg" style="width:70%;">
+</picture>
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+# System Structure and Parameterization (SSP)
+
+The System Structure and Parameterization (SSP) standard is a free standard that defines a tool-independent format for the description, packaging and exchange of system structures and their parameterization.
+It is currently supported by [8](https://ssp-standard.org/tools/) tools and maintained as a [Modelica Association Project](https://modelica.org/projects).
+
+[Releases](https://ssp-standard.org/) and the [latest development version](https://ssp-standard.org/docs/main/) of the specification are available on the [SSP website](https://ssp-standard.org/).
+
+## Repository Structure
+
+- `docs` -- sources of the specification document
+- `schema` -- XML schemas of the specified file formats
+- [CONTRIBUTING.adoc](CONTRIBUTING.adoc) -- information on contributing to the project and building the specification document
+- [README.md](README.md) -- this document
+
+## Branches
+
+- `main` -- development of the next release
+- `support/v{1|2}.0.x` -- maintenance of the 1.0 and 2.0 releases
+
+## Copyright and License
+
+XML schemas and documentation copyright &copy; 2016 - 2025 the Modelica Association Project SSP.
+XML schemas released under the [2-Clause BSD License](https://opensource.org/licenses/BSD-2-Clause).
+Documentation released under [Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/).