32 add license information for fixture grid files (#36)

* Add attribution fo OSTN15_NTv2_OSGBtoETRS.gsb * update change log
Rennzie · Nov 20, 2023 · 82f9ef0 · 82f9ef0
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -18,6 +18,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Attribution for `OSTN15_NTv1_OSGBtoETRS.gsb` [#32](https://github.com/Rennzie/geodesy-wasm/issues/32)
+
 ### Changed
 
 - Grids are stored in globally allocated heap memory [#34](https://github.com/Rennzie/geodesy-wasm/issues/34)

diff --git a/js/fixtures/README.md b/js/fixtures/README.md
@@ -0,0 +1,11 @@
+# Attribution and licenses
+
+## Ordinance Survey Open Data
+
+The OSGB to ETRS gridshift file `OSTN15_NTv2_OSGBtoETRS.gsb` is copy right by
+
+[Ordnance Survey 2023](https://www.ordnancesurvey.co.uk/about)
+
+It is distributed in the terms of [2-Clause BSD License](https://opensource.org/license/bsd-2-clause/)
+
+https://www.ordnancesurvey.co.uk/business-government/tools-support/os-net/for-developers