added zenodo properties

.zenodo.json

@@ -0,0 +1,14 @@
+{
+    "license": "MIT", 
+    "upload_type": "lesson",
+    "keywords": [ "SPH", "kernel", "simulations" ],
+    "language": "eng",
+    "creators": [
+        {
+            "affiliation": "Universitäts-Sternwarte, Fakultät für Physik, Ludwig-Maximilians-Universität München, Scheinerstr.1, 81679 München, Germany", 
+            "name": "Ludwig Böss",
+            "orcid": "https://orcid.org/0000-0003-4690-2774"
+        }
+    ],
+    "access_right": "open"
+}

README.md

@@ -1,6 +1,6 @@
-| **Documentation**                                                 | **Build Status**                                                                                | **Licence**                                                                                | **Version Status** |
+| **Documentation**                                                 | **Build Status**                                                                                | **Licence**                                                                                | **Citation** |
 |:-----------------------------------------------------------------:|:-----------------------------------------------------------------------------------------------:| :-----------------------------------------------------------------------------------------------:|:-----------:|
-[![](https://img.shields.io/badge/docs-stable-blue.svg)](https://LudwigBoess.github.io/SPHKernels.jl/stable) [![](https://img.shields.io/badge/docs-dev-blue.svg)](https://LudwigBoess.github.io/SPHKernels.jl/dev) | [![Run CI on master](https://github.com/LudwigBoess/SPHKernels.jl/actions/workflows/jlpkgbutler-ci-master-workflow.yml/badge.svg)](https://github.com/LudwigBoess/SPHKernels.jl/actions/workflows/jlpkgbutler-ci-master-workflow.yml) [![codecov.io](https://codecov.io/gh/LudwigBoess/SPHKernels.jl/coverage.svg?branch=master)](https://codecov.io/gh/LudwigBoess/SPHKernels.jl?branch=master) | [![The MIT License](https://img.shields.io/badge/license-MIT-orange.svg)](LICENSE.md) | ![TagBot](https://github.com/LudwigBoess/SPHKernels.jl/workflows/TagBot/badge.svg) ![CompatHelper](https://github.com/LudwigBoess/SPHKernels.jl/workflows/CompatHelper/badge.svg) |
+[![](https://img.shields.io/badge/docs-stable-blue.svg)](https://LudwigBoess.github.io/SPHKernels.jl/stable) [![](https://img.shields.io/badge/docs-dev-blue.svg)](https://LudwigBoess.github.io/SPHKernels.jl/dev) | [![Run CI on master](https://github.com/LudwigBoess/SPHKernels.jl/actions/workflows/jlpkgbutler-ci-master-workflow.yml/badge.svg)](https://github.com/LudwigBoess/SPHKernels.jl/actions/workflows/jlpkgbutler-ci-master-workflow.yml) [![codecov.io](https://codecov.io/gh/LudwigBoess/SPHKernels.jl/coverage.svg?branch=master)](https://codecov.io/gh/LudwigBoess/SPHKernels.jl?branch=master) | [![The MIT License](https://img.shields.io/badge/license-MIT-orange.svg)](LICENSE.md) | [![DOI](https://zenodo.org/badge/281332370.svg)](https://zenodo.org/badge/latestdoi/281332370) |
 
 # SPHKernels.jl