[SW-485] Update instructions for a new PYPI.org (#333)

* [SW-485] Update instructions for a new PYPI.org

py/PUBLISHING_TO_PYPI.rst

@@ -0,0 +1,50 @@
+This is tutorial how to publish PySparkling on PyPi
+===================================================
+
+1 - Build Sparkling Water. This is necessary step as the build process prepares additional packages which needs to be
+in the python package
+
+- sparkling_water package containing sparkling-water jar
+- h2o package containing h2o python files
+
+.. code:: bash
+
+    ./gradlew build -x check
+
+2 - Ensure you have ``.pypirc`` file in the ~ ( home) directory with the following content:
+
+.. code:: xml
+
+    [distutils]
+    index-servers =
+      pypi
+      pypitest
+
+    [pypi]
+    username=your_username_to_pypi
+    password=your_password_to_pypi
+
+    [pypitest]
+    repository=https://test.pypi.org/legacy/
+    username=your_username_to_testpypi
+    password=your_password_to_testpypi
+
+
+There are actually two servers - pypi and pypitest. Pypi is live server where the package needs to be uploaded
+and pypitest is just for testing that our package uploads well on the server and has correct format.
+
+3 - Go to ``py/build/pkg``
+
+4 - Test that the package successfully uploads to pypi test by running:
+
+.. code:: bash
+
+    python setup.py sdist upload -r pypitest
+
+5 - If everything goes well, upload the package to pypi live:
+
+.. code:: bash
+
+    python setup.py sdist upload -r pypi
+
+6 - That's it!