Create CITATION.cff (#3927)

Add citation source based on http://web.archive.org/web/20230610185232/https://portal.hdfgroup.org/display/knowledge/How+do+I+properly+cite+HDF5%2C+HDFView%2C+and+HSDS+in+a+paper. Created with https://citation-file-format.github.io/cff-initializer-javascript/

CITATION.cff

@@ -0,0 +1,12 @@
+cff-version: 1.2.0
+title: 'Hierarchical Data Format, version 5'
+message: >-
+  If you use this software, please cite it using the
+  metadata from this file.
+type: software
+authors:
+  - name: The HDF Group
+    website: 'https://www.hdfgroup.org'
+repository-code: 'https://github.com/HDFGroup/hdf5'
+url: 'https://www.hdfgroup.org/HDF5/'
+repository-artifact: 'https://www.hdfgroup.org/downloads/hdf5/'