Add musl-libc math library to resources.

Author: ViralBShah

docs/index.html

@@ -64,6 +64,7 @@ <h3>
 <a id="other-relevant-projects" class="anchor" href="#other-relevant-projects" aria-hidden="true"><span class="octicon octicon-link"></span></a>Other relevant projects</h3>
 
 <ol>
+  <li> <a href="https://git.musl-libc.org/cgit/musl/tree/src/math">MUSL</a> The libm library in the musl-libc project</li>
   <li> <a href="http://www.netlib.org/fdlibm/">FDLIBM</a>: Freely Distributable Math Library</li>
   <li> <a href="http://lipforge.ens-lyon.fr/www/crlibm/">CRlibm</a>: Correctly Rounded mathematical library</li>
   <li> <a href="http://www.yeppp.info/">Yeppp!</a>: A high-performance SIMD-optimized mathematical library</li>