fill out readme

Author: mierzs

README.md

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-# pidgraph-notebooks
+# pidgraph-notebooks
+A collection of Jupyter notebooks with examples of querying different PID providers like [ORCID](https://orcid.org/), [ROR](https://ror.readme.io/), [Crossref](https://www.crossref.org/) and PID graphs like the [FREYA PID Graph](https://blog.datacite.org/powering-the-pid-graph/) and [OpenAlex](https://openalex.org/about) for connected objects. 
+
+Currently included connections:
+* organization-organization
+* organization-people
+* person-works
+
+Please navigate into the respective folder to see the list of available notebooks. While GitHub renders Jupyter notebooks as static HTML files (not executable), each folder includes a README with links to launch the notebooks in Google Colaboratory where you can execute and modify them.
+
+----------------------------
+
+### Background
+In the joint project [TAPIR](https://projects.tib.eu/tapir/en/) (Partially Automated Persistent Identifier-based Reporting), partially automated procedures for research reporting are being tested in the context of university and non-university research. To this end, the question is being investigated : 
+
+To what extent can the necessary data aggregation be carried out on the basis of openly available research information using persistent identifiers?