added developer-guide.md

docs/developer-guide.md

+#Developer guide
+
+Thank you for your interest in developing wetb. This guide details how to contribute to wetb in a way that is efficient for everyone.
+
+##Contents
+
+- [Fork](#Fork-project)
+- [Requirements](#Requirements)
+- [Install Python](#Install-Python)
+- [Install dependencies](#Install-dependencies)
+- [Get wetb](#Get-wetb)
+- [Install wetb](#Install-wetb) 
+- [Contributions](#Contributions)
+- [Upload contributions](#Upload-contributions)
+- [Make and upload wheels](#Make-and-upload-wheels)
+ 
+
+
+
+##Fork project
+We prefer that you make your contributions in your own fork of the project, [make your changes](#Contributions) and [make a merge request](#Upload contributions).
+
+The project can be forked to your own user account via the \<Fork\> button on the [frontpage](https://gitlab.windenergy.dtu.dk/toolbox/WindEnergyToolbox)
+
+
+##Requirements
+
+### Command line
+
+This guide will use the command line (aka command prompt) frequently.
+You can launch a Windows terminal as follows: press Start> and type
+"cmd" + \<Enter\>. A link to the command prompt should be visible now.
+
+In case you want an alternative, more capable windows terminal, you could consider
+using [ConEmu](https://conemu.github.io/) (this is optional).
+
+> ConEmu-Maximus5 is a Windows console emulator with tabs, which presents
+> multiple consoles and simple GUI applications as one customizable GUI window
+> with various features.
+
+
+### Git
+
+* Download and install Git version control system for Windows 64-bit
+[here](https://git-scm.com/download/win). Only select the Windows Portable
+option if you know what you are doing or if you do not have administrative
+rights on your computer.
+
+* Git comes with a simple GUI, but there are more and different options available
+if you are not happy with it, see [here](https://git-scm.com/downloads/guis).
+
+* On windows we highly recommend [tortoisegit](https://tortoisegit.org/). It is a gui integrated into the windows explorer. 
+
+
+##Install Python
+For all platforms we recommend that you download and install the Anaconda - a professional grade, full blown scientific Python distribution. 
+
+### Installing Anaconda, activate root environment
+
+* Download and install Anaconda (Python 3.5 version, 64 bit installer is recommended) from <https://www.continuum.io/downloads>
+
+> Note: The Python 2.7 or Python 3.5 choice of Anaconda only affects the
+root environment. You can always create additional environments using other
+Python versions, see below.
+
+* Update the root Anaconda environment (type in a terminal):
+
+```
+>> conda update --all
+```
+
+* Activate the Anaconda root environment in a terminal as follows:
+
+```
+>> activate
+```
+
+and your terminal will do something like:
+```
+C:\Users\> activate
+[Anaconda3] C:\Users\>
+```
+note that the name of the environment is now a prefix before the current path.
+
+use ```deactivate``` to deactivate the environment.
+
+
+### Optionally, create other independent Anaconda environments
+
+* By using environments you can manage different Python installations with
+different versions on your system. Creating environments is as easy as:
+
+```
+>> conda create -n py27 python=2.7
+>> conda create -n py34 python=3.4
+>> conda create -n py35 python=3.5
+```
+
+* These environments can be activated as follows:
+
+```
+>> activate py27
+>> activate py34
+>> activate py35
+```
+
+The Python distribution in use will now be located in e.g. \<path_to_anaconda\>/env/py35/
+
+use ```deactivate``` to deactivate the environment.
+ 
+
+##Install dependencies
+
+Install the necessary Python dependencies using the conda package manager:
+
+```
+>> conda install setuptools_scm future h5py pytables pytest nose sphinx
+>> conda install scipy pandas matplotlib cython xlrd coverage xlwt openpyxl psutil
+>> conda install -c https://conda.anaconda.org/conda-forge pyscaffold pytest-cov
+```
+
+##Get wetb
+
+Copy the https - link on the front page of your fork of wetb
+
+```
+>> git clone <https-link>
+```
+
+or via tortoise-git:
+
+- Right-click in your working folder
+- "Git Clone..."
+- \<Ok\>
+
+##Install wetb
+```
+>> cd WindEnergyToolbox
+>> pip install -e . --no-deps
+```
+
+##Contributions
+
+If you make a change in the toolbox, that others can benefit from please make a merge request.
+
+If you can, please submit a merge request with the fix or improvements including tests. 
+
+The workflow to make a merge request is as follows:
+
+- Create a feature branch, branch away from master
+- Write tests and code
+- Push the commit(s) to your fork
+- Submit a merge request (MR) to the master branch of 
+- Link any relevant issues in the merge request description and leave a comment on them with a link back to the MR
+- Your tests should run as fast as possible, and if it uses test files, these files should be as small as possible.
+- Please keep the change in a single MR as small as possible. Split the functionality if you can
+
+##Upload contributions
+To be written
+
+
+##Make and upload wheels
+
+```
+>> conda install --channel https://conda.anaconda.org/pbrod twine
+```
+
+- Make tag
+- pip install -e . --upgrade
+- python setup.py bdist_wheel -d dist
+- twine upload dist\*
+