chore: add INSTRUCTIONS.txt file so package can be properly released

INSTRUCTIONS.txt

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+Configuration utilities for diffpy project. Part of xPDFsuite.
+
+------------------------------------------------------------------------
+1. License Notice
+
+Use of this software is permitted only under a separate, written
+Use License granted by Columbia University. If you are unsure about
+your license status, contact Prof. Simon Billinge at sb2896@columbia.edu
+before installing.
+
+Use without a valid license is prohibited.
+------------------------------------------------------------------------
+2. Installation
+
+This package is not designed to be installed standalone and is usually
+installed as part of the xpdfsuite package. Please refer to the
+INSTRUCTIONS.txt file and any other installation directions in the
+diffpy.xpdfsuite software.

news/add-instructions.rst

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+**Added:**
+
+* No news added: Trivial addition to package to get workflow script to run
+
+**Changed:**
+
+* <news item>
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* <news item>
+
+**Security:**
+
+* <news item>