add news

Author: Tieqiong

news/setup.rst

@@ -0,0 +1,24 @@
+**Added:**
+
+* Added additional runtime linker flags in `CustomBuildExt.run` to embed the `RPATH` flags for the built extensions.
+* Support for retrieving GSL configuration from `CONDA_PREFIX`/ `GSL_PATH` on all platforms.
+
+**Changed:**
+
+* Merged the GSL configuration logic in `setup.py`.
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* <news item>
+
+**Security:**
+
+* <news item>