Add citation.cff file

CITATION.cff

@@ -0,0 +1,38 @@
+# This CITATION.cff file was generated with cffinit.
+# Visit https://bit.ly/cffinit to generate yours today!
+
+cff-version: 1.2.0
+title: 'NetCDF-C '
+message: >-
+  If you use this software, please cite it using the
+  metadata from this file.
+type: software
+authors:
+  - name: NSF Unidata
+    website: 'https://unidata.ucar.edu'
+identifiers:
+  - type: doi
+    value: 10.5065/D6H70CW6
+    description: NetCDF-C library
+  - type: url
+    value: 'https://www.unidata.ucar.edu/software/netcdf/'
+    description: NetCDF Homepage
+repository-code: 'https://github.com/Unidata/netcdf-c'
+keywords:
+  - data
+  - netcdf
+  - netcdf-c
+  - data model
+  - software
+  - NSF
+license: "BSD-3-Clause"
+contact:
+  - name: Unidata
+    city: Boulder
+    region: Colorado
+    country: US
+    email: "[email protected]"
+    tel: "303-497-8643"
+    fax: "303-497-8690"
+    website: "https://www.unidata.ucar.edu"
+doi: "10.5065/D6H70CW6"

Makefile.am

@@ -33,7 +33,7 @@ cmake CMakeLists.txt COMPILE.cmake.txt config.h.cmake.in		\
 cmake_uninstall.cmake.in FixBundle.cmake.in nc-config.cmake.in		\
 RELEASE_NOTES.md CTestConfig.cmake.in CTestCustom.cmake.in		\
 libnetcdf.settings.in netCDFConfig.cmake.in CMakeInstallation.cmake	\
-test-driver-verbose test_common.in fuzz
+test-driver-verbose test_common.in fuzz CITATION.cff
 
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = netcdf.pc