adding citation file (#1512)

Author: jogomojo

CITATION.cff

@@ -0,0 +1,11 @@
+cff-version: 1.2.0
+message: "If you use PYNQ in your research, please cite it using the metadata below."
+authors:
+  - name: 'Advanced Micro Devices, Inc.'
+title: "PYNQ"
+type: software
+license: 'BSD-3-Clause'
+version: 3.1.1
+date-released: "2025-09-24"
+url: 'https://pynq.io'
+repository-code: "https://github.com/Xilinx/PYNQ"

README.md

@@ -52,6 +52,10 @@ for how to improve PYNQ.
 
 Please ask questions on the <a href="https://discuss.pynq.io" target="_blank">PYNQ support forum</a>.
 
+## Citing PYNQ
+
+If you use PYNQ in your research, please cite this GitHub repository by using the metadata given in <a href="https://github.com/Xilinx/PYNQ/blob/master/CITATION.cff" target="_blank">CITATION.cff</a>.
+
 ## Licenses
 
 **PYNQ** License: [BSD 3-Clause License](https://github.com/Xilinx/PYNQ/blob/master/LICENSE)