docs: add bullet point for TypeScript to features

Author: Planeshifter

README.md

@@ -139,6 +139,12 @@ This is the GitHub repository of stdlib source code and documentation. For help
         <img src="https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@e54894a93697653dda22d11cd0aec1ccb292b7b8/docs/assets/readme/bundled.png" alt="Demo showcasing browser support">
     </div>
 
+-   Every function is accompanied by [TypeScript][typescript] declaration files, ensuring type safety and allowing for  intelligent code completion in IDEs.
+
+    <div class="image" align="center">
+        <img src="https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@f5f1f915a7178d9bc76a95d34afd799e6092ec3a/docs/assets/readme/typescript.png" alt="Demo showcasing TypeScript declaration files" >
+    </div>
+
 * * *
 
 ## Installation
@@ -774,6 +780,8 @@ Test and build infrastructure is generously provided by the following services:
 
 [webpack]: https://webpack.js.org/
 
+[typescript]: https://www.typescriptlang.org/
+
 [unpkg]: https://unpkg.com/#/
 
 [jsdelivr]: https://www.jsdelivr.com/