add small summary

Author: Sven Twardziok

docs/guides/index.md

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+# ELIXIR-on-Cloud documentation
+
+The ELIXIR-on-Cloud project is an initiative from the ELIXIR Compute Platform.
+Our goal is to support scientists across Europe in using cloud environments for their research activities.
+We support the use of ELIXIR services as well as open-source software, and the project has close connections with various academic cloud providers.
+One of our key focuses is developing and providing software that implements the specifications defined by the Global Alliance for Genomics and Health (GA4GH) for federated processing of workloads ([GA4GH Cloud Work Stream](https://www.ga4gh.org/work_stream/cloud/)).
+This documentation here offers guidance and best practices on how to use the services, further develop our services, and deploy services within the ELIXIR-on-Cloud Framework.