Add windows to classifiers, add platform badge

Author: rhpvorderman

README.rst

@@ -14,6 +14,9 @@
   :target: https://github.com/LUMC/isal/blob/main/LICENSE
   :alt:
 
+.. image:: https://img.shields.io/conda/pn/conda-forge/python-isal.svg
+  :alt:
+
 .. image:: https://travis-ci.com/pycompression/python-isal.svg?branch=develop
   :target: https://travis-ci.com/github/pycompression/python-isal
   :alt:

setup.py

@@ -184,7 +184,8 @@ def build_isa_l():
         "Topic :: System :: Archiving :: Compression",
         "License :: OSI Approved :: MIT License",
         "Operating System :: POSIX :: Linux",
-        "Operating System :: MacOS"
+        "Operating System :: MacOS",
+        "Operating System :: Microsoft :: Windows",
     ],
     python_requires=">=3.6",
     ext_modules=MODULES