Update README.md

Author: heltonmc

README.md

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-# Bessels
-
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+# Bessels.jl
 
+Implementations of Bessel's functions `besselj0`, `besselj1`, `bessely0`, `bessely1`, `besseli0`, `besseli1`, `besselk0`, `besselk1` in Julia.
+Most implementations are ported to Julia from the [Cephes](https://www.netlib.org/cephes/) math library  originally written by Stephen L. Moshier in the C programming language
+which are (partly) used in [SciPy](https://docs.scipy.org/doc/scipy/reference/special.html#faster-versions-of-common-bessel-functions) and [GCC libquadmath](https://gcc.gnu.org/onlinedocs/libquadmath/).
 
 # Benchmarks