Add citation file

CITATION.cff

@@ -10,24 +10,24 @@ authors:
     family-names: Yang
     email: ayang2@caltech.edu
     affiliation: Caltech
-    orcid: 'https://orcid.org/0000-0003-0553-715X'
+    orcid: "https://orcid.org/0000-0003-0553-715X"
   - given-names: Christopher
     family-names: Farrow
-    orcid: 'https://orcid.org/0000-0001-5768-6654'
+    orcid: "https://orcid.org/0000-0001-5768-6654"
   - given-names: Chia-Hao
     family-names: Liu
     affiliation: Columbia University
-    orcid: 'https://orcid.org/0000-0002-3216-0354'
+    orcid: "https://orcid.org/0000-0002-3216-0354"
   - given-names: Luis
     family-names: Kitsu
-    orcid: 'https://orcid.org/0000-0002-9292-4416'
+    orcid: "https://orcid.org/0000-0002-9292-4416"
     affiliation: University of Colorado Boulder
     email: Luis.Kitsu@echemes.ethz.ch
   - given-names: Simon
     family-names: Billinge
     email: sb2896@columbia.edu
     affiliation: Columbia University
-    orcid: 'https://orcid.org/0000-0002-9734-4998'
+    orcid: "https://orcid.org/0000-0002-9734-4998"
 abstract: >-
   diffpy.morph is an open-source and free-to-use Python
   package that increases the insight researchers can obtain
@@ -47,9 +47,9 @@ abstract: >-
   comparison. Other morphs are also possible such as
   corrections for nanoparticle shape effects on the PDF.
   diffpy.morph is model-independent and also could be used
-  on other non-diffraction spectra, though 
-  it has not been extensively tested beyond powder
-  diffraction patterns and the PDF.
+  on other non-diffraction spectra, though it has not been
+  extensively tested beyond powder diffraction patterns
+  and the PDF.
 keywords:
   - diffpy
   - pdf

news/citation.rst

@@ -0,0 +1,23 @@
+**Added:**
+
+* no news: style changes
+
+**Changed:**
+
+* <news item>
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* <news item>
+
+**Security:**
+
+* <news item>