Update README.md

Author: n8thangreen

README.md

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 [![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
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-> Model-based Standardisation with G-estimation
+> Model-based Standardisation with G-computation
 
 ## Overview
 
@@ -19,6 +19,15 @@ Key features include:
 - **Multiple imputation marginalisation**
 - **MAIC, STC** for comparison
 
+## Who is this package for?
+
+The target audience of `outstandR` is those who want to perform model-based standardization in the specific context of two-study indirect treatment comparisons with limited subject-level data. This is model-based standardization with two additional steps:
+
+1. Covariate simulation (to overcome limited subject-level data for one of the studies)
+2. Indirect comparison across studies
+
+## Background
+
 This R package contains code originally written for the papers:
 
 > Remiro-Azócar, A., Heath, A. & Baio, G. (2022) _Parametric G-computation for Compatible Indirect Treatment Comparisons with Limited Individual Patient Data._