Add zenodo badge to README, remove .md from LICENSE

Author: tpapp

LICENSE

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+MIT License
+
+Copyright (c) 2018–2024: Tamás K. Papp.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

LICENSE.md

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 [![codecov.io](http://codecov.io/github/tpapp/LogDensityProblems.jl/coverage.svg?branch=master)](http://codecov.io/github/tpapp/LogDensityProblems.jl?branch=master)
 [![Documentation](https://img.shields.io/badge/docs-stable-blue.svg)](https://tpapp.github.io/LogDensityProblems.jl/stable)
 [![Documentation](https://img.shields.io/badge/docs-master-blue.svg)](https://tpapp.github.io/LogDensityProblems.jl/dev)
+[![DOI](https://zenodo.org/badge/140587796.svg)](https://doi.org/10.5281/zenodo.13885021)
 
 A common framework for implementing and using log densities for inference, providing the following functionality.