docs: add citation references [skip ci] (#109)

Signed-off-by: Alessandro Pomponio <[email protected]>

CITATION.cff

@@ -0,0 +1,35 @@
+# This CITATION.cff file was generated with cffinit.
+# Visit https://bit.ly/cffinit to generate yours today!
+
+cff-version: 1.2.0
+title: Simulation Toolkit for Scientific Discovery
+message: >-
+  If you use this software, please cite it using the
+  metadata from this file.
+type: software
+authors:
+  - given-names: Michael A.
+    family-names: Johnston
+    affiliation: IBM Research
+  - given-names: Vassilis
+    family-names: Vassiliadis
+    affiliation: IBM Research
+  - given-names: Alessandro
+    family-names: Pomponio
+    affiliation: IBM Research
+    orcid: 'https://orcid.org/0000-0003-1655-7500'
+  - given-names: Edward
+    family-names: Pyzer-Knapp
+    affiliation: IBM Research
+identifiers:
+  - type: url
+    value: 'https://github.com/st4sd/st4sd-runtime-core'
+    description: ST4SD Runtime
+repository-code: 'https://github.com/st4sd/st4sd-runtime-core'
+url: 'https://st4sd.github.io/overview/'
+keywords:
+  - accelerated-discovery
+  - simulation
+  - toolkit
+license: Apache-2.0
+date-released: '2022-12-08'

README.md

@@ -38,6 +38,21 @@ Please feel free to reach out to one of the maintainers listed in the [MAINTAINE
 
 We always welcome external contributions. Please see our [guidance](CONTRIBUTING.md) for details on how to do so.
 
+## References
+
+If you use ST4SD in your projects, please consider citing the following:
+
+```bibtex
+@software{st4sd_2022,
+author = {Johnston, Michael A. and Vassiliadis, Vassilis and Pomponio, Alessandro and Pyzer-Knapp, Edward},
+license = {Apache-2.0},
+month = {12},
+title = {{Simulation Toolkit for Scientific Discovery}},
+url = {https://github.com/st4sd/st4sd-runtime-core},
+year = {2022}
+}
+```
+
 ## License
 
 This project is licensed under the Apache 2.0 license. Please [see details here](LICENSE.md).