added readme

Author: tobydriscoll

README.md

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+# FundamentalsNumericalComputation.jl
+
+These are Julia implementations the functions that are defined in the first edition of [*Fundamentals of Numerical Computation*](https://tobydriscoll.net/fnc) by Driscoll and Braun. They are mostly compatible with the original MATLAB functions, except that input and output formats have been changed to be compatible with major packages listed below.
+
+The package does not export its own functions, but it does export the name `FNC` as a shorthand for the full package name. It does re-export the following:
+
+* LinearAlgebra
+* Plots
+* SparseArrays
+* Polynomials
+* NLsolve
+* DifferentialEquations
+* DataFrames
+* Interpolations
+
+**This is work in progress**. There will be cosmetic changes as well as possible breaking changes in future versions. In particular, the functions from Chapters 7-12 have not yet been thoroughly reviewed and tested. No warranty for correctness is implied.