add paper badge, pdf and citation information (SERVIR#64)

* add paper citations and badge

* add published paper

Author: biplovbhandari

CITATION.cff

@@ -0,0 +1,34 @@
+cff-version: "1.2.0"
+authors:
+- family-names: Bhandari
+  given-names: Biplov
+  orcid: "https://orcid.org/0000-0001-6169-8236"
+- family-names: Mayer
+  given-names: Timothy
+  orcid: "https://orcid.org/0000-0001-9489-9392"
+doi: 10.5281/zenodo.12687267
+message: If you use this software, please cite our article in the
+  Journal of Open Source Software.
+preferred-citation:
+  authors:
+  - family-names: Bhandari
+    given-names: Biplov
+    orcid: "https://orcid.org/0000-0001-6169-8236"
+  - family-names: Mayer
+    given-names: Timothy
+    orcid: "https://orcid.org/0000-0001-9489-9392"
+  date-published: 2024-07-10
+  doi: 10.21105/joss.06729
+  issn: 2475-9066
+  issue: 99
+  journal: Journal of Open Source Software
+  publisher:
+    name: Open Journals
+  start: 6729
+  title: "servir-aces: A Python Package for Training Machine Learning
+    Models for Remote Sensing Applications"
+  type: article
+  url: "https://joss.theoj.org/papers/10.21105/joss.06729"
+  volume: 9
+title: "servir-aces: A Python Package for Training Machine Learning
+  Models for Remote Sensing Applications"

README.md

@@ -1,5 +1,6 @@
 # ACES (Agricultural Classification and Estimation Service)
 
+[![DOI](https://joss.theoj.org/papers/10.21105/joss.06729/status.svg)](https://doi.org/10.21105/joss.06729)
 [![image](https://img.shields.io/pypi/v/servir-aces.svg)](https://pypi.python.org/pypi/servir-aces)
 [![Conda Recipe](https://img.shields.io/badge/recipe-servir--aces-green.svg)](https://github.com/conda-forge/servir-aces-feedstock)
 [![image](https://img.shields.io/conda/vn/conda-forge/servir-aces.svg)](https://anaconda.org/conda-forge/servir-aces)