Drafting guidelines page

Contributing-guidelines-for-developers.md

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+## This page is a draft.
+
+Please review these guidelines before submitting a PR, to make the maintainers' jobs easier:
+
+***(!) From the wiki homepage; some of these may be outdated.***
+
+* Manuskript is written in Python3 and PyQt5
+* All code changes and Pull Requests should be based on the **develop** branch.
+* The minimum target screen resolution is 1024x600 (was popular with small laptops / netbooks)
+* We strive to conform to Qt guidelines.  E.g.: [User Interface Text Guidelines](https://doc-snapshots.qt.io/qtcreator-extending/qtcreator-ui-text.html) ***Link broken!***
+* Tip:  Add `--console` as last option on command line to use [IPython Jupyter QT Console as a debugging aid](https://github.com/olivierkes/manuskript/pull/513).
+* _**DRAFT**_  
+  We _try_ to ensure that Manuskript will run on currently supported Operating Systems with [Qt integration](https://stackoverflow.com/questions/12805036/qicon-fromtheme-not-displaying-icon-in-pyqt).  This includes several  GNU/Linux distributions, in addition to recent versions of proprietary Windows and macOS X.  
+  OSes we often use in our testing include: [Debian](https://en.wikipedia.org/wiki/Debian), [Fedora](https://en.wikipedia.org/wiki/Fedora_%28operating_system%29), [Ubuntu](https://en.wikipedia.org/wiki/Ubuntu), and [Windows](https://en.wikipedia.org/wiki/Microsoft_Windows).  
+  No promise of support is provided.  See also [GNU General Public License](https://www.gnu.org/licenses/gpl-3.0.en.html).
+* [[Roadmap]] contains some potential future plans.
+
+___New___
+
+### Code Style
+* The codebase mostly follows [PEP8](https://www.python.org/dev/peps/pep-0008/).
+
+### Documentation
+* (In-code documentation)
+* If you add or change a feature, please update the end-user docs or request for someone in the community to do so.
+
+### Logging
+Avoid using `print()` statements in the code, which will be seen by end users. All logging should be done through the python `logging` module as follows:
+```
+import logging
+LOGGER = logging.getLogger(__name__)
+
+# Inside your code
+LOGGER.warning("This is my warning message.")
+```
+See [here](https://docs.python.org/3/library/logging.html) for more on the logging module and the different message levels.
+
+### UI