Add newly minted DOI (#12)

* add doi badge to README
* add newly minted doi to citation.cff

Author: Sandra Mierz

CITATION.cff

@@ -11,6 +11,14 @@ authors:
     orcid: "https://orcid.org/0000-0002-8913-9011"
 repository-code: "https://github.com/Project-TAPIR/pidgraph-notebooks"
 license: "BSD-3-Clause"
+doi: "10.5281/zenodo.6287038"
+identifiers:
+  - description: "This is the collection of archived snapshots of all versions of Project-TAPIR: pidgraph-notebooks"
+    type: doi
+    value: "10.5281/zenodo.6287037"
+  - description: "This is the archived snapshot of version 1.0.0 of Project-TAPIR: pidgraph-notebooks"
+    type: doi
+    value: "10.5281/zenodo.6287038"
 keywords:
   - "FREYA PID Graph"
   - "ORCID"

README.md

@@ -1,4 +1,6 @@
 # pidgraph-notebooks
+
+[![DOI](https://zenodo.org/badge/447263093.svg)](https://zenodo.org/badge/latestdoi/447263093)
 [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/Project-TAPIR/pidgraph-notebooks/main)
 
 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.