Update README.md

README.md

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 # rjd3toolkit
-Basic package around JDemetra+ 3.x
+
+Utility package in JDemetra+ 3.x R ecosystem. Contains utility functions used in other `rjd3` packages and has to be systematically installed before using any other rjd3 package. 
+
+## Main Functions 
+
+- customize specifications in rjd3x13 and rjdtramoseats
+
+- generate user-defined regressors for calendar correction
+
+- generate auxiliary variables (outliers, ramps..)
+
+- run arima model estimations
+
+- perform tests (seasonality, normality, white noise)
+
+- access general functions such as auto-correlations, distributions
+
 
 ## Installation
 
@@ -16,3 +32,5 @@ To get the current development version from GitHub:
 # install.packages("remotes")
 remotes::install_github("rjdemetra/rjd3toolkit")
 ```
+
+