README.md (#73)

First README.md explaining installation and start

Author: PaulJonasJost

README.md

@@ -1,2 +1,30 @@
-# pyPESTO_GUI
-a graphical user-interface for pyPESTO and PEtab
+# PEtabGUI
+
+This is a graphical user interface to create parameter estimation problems. It is 
+based on the [PEtab](https://petab.readthedocs.io/en/latest/#) format.
+
+## Installation
+
+To install the PEtabGUI, you can follow these steps:
+
+1. Clone the repository:
+```bash
+git clone https://github.com/PaulJonasJost/PEtab_GUI.git
+```
+
+2. Pip install the PEtab GUI:
+```bash
+pip install .
+```
+(Run this command line within the repository folder)
+
+
+## Usage
+
+To start the PEtab GUI, you can run the following command line:
+```bash
+PEtab_gui $PATH_TO_YOUR_MODEL
+```
+where `$PATH_TO_YOUR_MODEL` is an optional argument with a file path of your 
+yaml-model file in case you want to work on an existing model. You can also leave this 
+argument out to start from scratch.