Update README.md

README.md

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-# lmfit-additional-models
+# lmfitxps
+## Introduction
+Welcome to lmfitxps, a small Python package designed as an extension for the popular lmfit package , specifically tailored for X-ray Photoelectron Spectroscopy (XPS) data analysis.
+
+While lmfit provides simple tools to build complex fitting models for non-linear least-squares problems and applies these models to real data, as well as introduces several built-in models, lmfitxps acts as an extension to lmfit designed for XPS data analysis. lmfitxps provides a comprehensive set of functions and models that facilitate the fitting of XPS spectra. In particular, lmfitxps provides several models, which use the convolution of a gaussian with model functions of the lmfit-package.
+
+In addition to models for fittig signals in XPS data, lmfitxps introduces several background models which can be included in the fit model for fitting the data rather then substracting a precalculated background. This is the so-called active approach as suggested by A. Herrera-Gomez and generally leads to better fit results.
+For further details, please refer to the documentation of [lmfitxps](https://lmfitxps.readthedocs.io/en/latest/index.html) and [lmfit](https://lmfit.github.io/lmfit-py/index.html)! 
+
+## Installation
+To install lmfitxps, simply use pip:
+
+ `pip install lmfitxps`