Merge pull request #3049 from martin-frbg/readme

Expand the introductory paragraph of the README with links to netlib docs and linear algebra lecture videos

README.md

@@ -13,10 +13,14 @@ Drone CI: [![Build Status](https://cloud.drone.io/api/badges/xianyi/OpenBLAS/sta
 
 ## Introduction
 
-OpenBLAS is an optimized Basic Linear Algebra Subprograms library based on GotoBLAS2 1.13 BSD version.
+OpenBLAS is an optimized BLAS (Basic Linear Algebra Subprograms) library based on GotoBLAS2 1.13 BSD version.
 
 Please read the documentation on the OpenBLAS wiki pages: <https://github.com/xianyi/OpenBLAS/wiki>.
 
+For a general introduction to the BLAS routines, please refer to the extensive documentation of their reference implementation hosted at netlib:
+<https://www.netlib.org/blas>. On that site you will likewise find documentation for the reference implementation of the higher-level library LAPACK - the **L**inear **A**lgebra **Pack**age that comes included with OpenBLAS. If you are looking for a general primer or refresher on Linear Algebra, the set of six
+20-minute lecture videos by Prof. Gilbert Strang on either MIT OpenCourseWare <https://ocw.mit.edu/resources/res-18-010-a-2020-vision-of-linear-algebra-spring-2020/> or Youtube <https://www.youtube.com/playlist?list=PLUl4u3cNGP61iQEFiWLE21EJCxwmWvvek> may be helpful.
+
 ## Binary Packages
 
 We provide official binary packages for the following platform: