Update README.md

jaehyukchoi · web-flow · commit 08aed903717e · 2021-01-26T23:53:46.000+08:00
diff --git a/README.md b/README.md
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 # BlackScholes-R
 Black-Scholes and Bachelier option price and implied volatility functions in R
+
+## Installation
+Install `devtools` package in run
+```R
+library(devtools)
+install_github("PyFE/BlackScholes-R", subdir="pakage")
+```
