docs: add copy

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Author: kgryte

lib/node_modules/@stdlib/math/tools/unary/README.md

@@ -26,6 +26,12 @@ limitations under the License.
 
 <section class="intro">
 
+The purpose of this package is to provide a thin wrapper around a lower-level interface supporting multiple dispatch based on the data types of provided ndarray arguments. The wrapper performs the following tasks:
+
+-   validates input arguments.
+-   casts input ndarrays according to a casting policy.
+-   allocates an output ndarray according to an output data type policy.
+
 </section>
 
 <!-- /.intro -->