add platforms

Author: tomvanmele

README.md

@@ -5,6 +5,7 @@
 [![PyPI - Python Version](https://img.shields.io/pypi/pyversions/COMPAS.svg)](https://pypi.python.org/project/COMPAS)
 [![PyPI - Latest Release](https://img.shields.io/pypi/v/COMPAS.svg)](https://pypi.python.org/project/COMPAS)
 [![Conda - Latest Release](https://anaconda.org/conda-forge/compas/badges/version.svg)](https://anaconda.org/conda-forge/compas)
+[![Conda - Platform](https://img.shields.io/conda/pn/conda-forge/compas)](https://anaconda.org/conda-forge/compas)
 [![DOI](https://zenodo.org/badge/104857648.svg)](https://zenodo.org/badge/latestdoi/104857648)
 
 The **COMPAS** framework is an open-source, Python-based framework for computational research and collaboration in architecture, engineering, digital fabrication and construction.