add badge to README (#188)

closes #187

README.md

@@ -1,3 +1,7 @@
+<!-- badges: start -->
+[![Lifecycle: experimental](https://img.shields.io/badge/lifecycle-experimental-orange.svg)](https://lifecycle.r-lib.org/articles/stages.html#experimental)
+<!-- badges: end -->
+
 # workflow.data.preparation
 
 `workflow.data.preparation` orchestrates the PACTA data preparation process, combining production, financial, scenario, and currency data into a format suitable for use in a PACTA for investors analysis. Assuming that the computing resource being used has sufficient memory (which can be >16Gb depending on the inputs), storage space, and access to the necessary inputs, this is intended to work on a desktop or laptop using RStudio or run using the included [Dockerfile](https://github.com/RMI-PACTA/workflow.data.preparation/blob/main/Dockerfile) and [docker-compose.yml](https://github.com/RMI-PACTA/workflow.data.preparation/blob/main/docker-compose.yml).