feat: add parser for vesta files and vesta app viewer.

Author: stevenhua0320

.codespell/ignore_words.txt

@@ -22,3 +22,7 @@ CONECT
 ;; /src/diffpy/structure/parsers/p_xcfg.py:452
 ;; used in a function
 BU
+
+;; /src/diffpy/structure/parsers/p_vesta.py:452
+;; abbreviation for Structure in vesta
+STRUC

news/vesta_view.rst

@@ -0,0 +1,23 @@
+**Added:**
+
+* Added parser for vesta specific files and viewer for vesta
+
+**Changed:**
+
+* <news item>
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* <news item>
+
+**Security:**
+
+* <news item>