add citation and zenodo badge

CITATION.cff

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+# This CITATION.cff file was generated with cffinit.
+# Visit https://bit.ly/cffinit to generate yours today!
+
+cff-version: 1.2.0
+title: >-
+  clumpedcalib: Calculate and apply clumped isotope calibrations using bootstrapping
+message: >-
+  If you use this software, please cite it using the
+  metadata from this file.
+type: software
+authors:
+  - given-names: Ilja Japhir
+    family-names: Kocken
+    email: [email protected]
+    affiliation: Utrecht University
+    orcid: 'https://orcid.org/0000-0003-2196-8718'
+identifiers:
+  - type: doi
+    value: 10.5281/zenodo.8148780
+    description: Zenodo
+repository-code: 'https://github.com/japhir/clumpedcalib'
+repository: 'https://zenodo.org/record/8148780'
+abstract: >-
+  This document describes how to calculate bootstrapped averages and apply a clumped-isotope specific temperature calibration.
+  - Calculate bootstrapped York regression from clumped isotope calibration data.
+  - Calculate bootstrapped sample means for the age, d13C, d18O, and D47.
+  - Apply the bootstrapped calibration to calculate temperature and d18Osw.
+keywords:
+  - clumped
+  - isotope
+  - clumped isotopes
+  - bootstrapping
+  - calibration
+license: GPL-3.0-or-later

README.org

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 * clumped isotope bootstrap calibration
+[[https://zenodo.org/badge/latestdoi/657580630][https://zenodo.org/badge/657580630.svg]]
+
 Written by [[https://orcid.org/0000-0003-2196-8718][Ilja J. Kocken]]
 Feel free to use this stuff, as long as you adhere to the [[file:LICENSE.md]]