Add production file

PRODUCTION.md

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+# Production
+
+Of course, until you start these steps, make sure the package have passed all
+tests and checkers before continue.
+
+- Create a `.pypirc` file in your home folder with this
+    ```bash
+        [distutils]
+        index-servers =
+        pypi
+        testpypi
+
+        [pypi]
+        repository:https://pypi.python.org/pypi
+        username=your username
+
+        [testpypi]
+        repository: https://test.pypi.org/legacy/
+        username=your username
+    ```
+
+    If you want to put also your password in that file, remember to set
+    appropriated permission to it.
+
+    *Note that you need to create an account for both sites.*
+
+- Install TWine
+    ```bash
+        sudo apt install twine
+    ```
+
+- Register if necessary
+    ```bash
+        python setup.py register
+    ```
+
+- Create a distribution (code package and wheel)
+    ```bash
+        python setup.py sdist bdist_wheel
+    ```
+
+- Test uploading using Twine
+    ```bash
+        twine upload -r testpypi dist/*
+    ```
+
+- Check if things are OK on [PyPI test page](https://test.pypi.org/project/QDarkStyle).
+
+- Test installing using pip from test PyPI
+    ```bash
+        pip install --index-url https://test.pypi.org/project/ qdarkstyle
+    ```
+
+- **If you make sure all things are OK**, upload officialy
+    ```bash
+        twine upload -r pypi dist/*
+    ```
+
+- Check if things are OK on [PyPI official page](https://pypi.python.org/pypi/QDarkStyle).
+
+- Test installing using pip
+    ```bash
+        pip install qdarkstyle
+    ```