update README file

README.md

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 # radiosim
 Simulation of radio skies to create astrophysical data sets.
+This repository is part of the [`radionets-project`](https://github.com/radionets-project).
+
+## Installation
+
+This repository is built as a python package. We recommend creating a mamba environment to handle the dependencies of all packages.
+You can create one by running the following command in this repository:
+```
+$ mamba env create -f environment.yml
+```
+You can start the environment with
+```
+$ mamba activate radiosim
+```
+after the installation.
+
+## Usage
+
+There are currently three supported simulation types: 
+1. `survey` full sky simulation
+2. `jet` extended source
+3. `mojave` MOJAVE like extended source
+
+In the `radiosim` environment you can start the simulation with
+```
+$ radiosim path/to/rc/file.toml
+```
+You can find an exemplary file in `rc/default_simulation.toml`.
+The simulations will be saved as `.h5` files.