R: Vignettes and other documentation

# Vignettes and other documentation

## Vignettes from package 'greeks'

greeks::american-options |  | American options and Greeks | HTML | source | R code
greeks::asian-options |  | Asian options and Greeks | HTML | source | R code
greeks::european-options |  | European options and Greeks | HTML | source | R code
greeks::implied-volatility |  | Implied volatility | HTML | source | R code
greeks::using_greeks |  | greeks: Sensitivities of Prices of Financial Options and Implied Volatilities | HTML | source | R code