Included contributing section into README:

.github/pull_request_template.md

@@ -0,0 +1,10 @@
+* [ ] Have you followed our guidelines in Section "Contributing" from README.md? 
+* [ ] Have you checked already existing notebooks to get an idea about our tutorial style?
+* [ ] Have you extensively used markdown elements to structure and explain your notebook?
+* [ ] Have you self-reviewed your code / notebook and corrected any misspellings? 
+* [ ] Have you uploaded your example data to [zenodo]( https://zenodo.org/ ) (see README) if needed?
+* [ ] Have you checked if your notebook is running in the recommended standard conda enviroment [see here]((docs/RunningTutorials.md) and updates the [list of required python packages](./requirements.txt) if needed?
+* [ ] Have you carefully checked that sphinx-based rendering is still working correctly?
+* [ ] Have you written descriptive commit messages? 
+* [ ] Have you kept your pull request small and limited so that it is easy to review? 
+* [ ] Have the newest changes been merged into this branch? 

README.md

@@ -1,6 +1,6 @@
 # tobac-tutorials
 
-Tobac tutorials show different application cases for the cloud and precipitation tracking software tobac using jupyter notebooks. Th rendered versions of our tutorials are provided at [https://fsenf-tobac-tutorials.readthedocs.io](https://fsenf-tobac-tutorials.readthedocs.io). Please have a look there, first!
+Tobac tutorials show different application cases for the cloud and precipitation tracking software tobac using jupyter notebooks. The rendered versions of our tutorials are provided at [https://fsenf-tobac-tutorials.readthedocs.io](https://fsenf-tobac-tutorials.readthedocs.io). Please have a look there, first!
 
 
 ## Getting Started
@@ -13,3 +13,38 @@ A step-by-step description to run the tutorials with jupyter is located [here](d
 ## Limitations
 
 If you are using tobac 1.x, the notebooks here won#t work because of changes in the code structure. The equivalent notebooks can be found in the [examples](https://github.com/climate-processes/tobac/tree/master/examples) folder in the [tobac master branch](https://github.com/climate-processes/tobac/tree/master/examples).
+
+
+## Contributing
+You contribution is welcome! 
+
+Each additional tutorial notbeook helps new `tobac` users to understand the capability of the tracking software and supports creative use of feature identification and tracking in the atmospheric science context.
+
+
+### Pull Request Requirements
+
+Please provide a separate pull request:
+
+* **with your example notebook included**
+  * please extensively use markdown elements to structure and explain your notebook
+  * check already existing notebooks to get an idea about our tutorial style
+  * please upload your example data to [zenodo]( https://zenodo.org/ ) (see next paragraph)
+  * please check if your notebook is running in the recommended standard conda enviroment [see here]((docs/RunningTutorials.md) and update the [list of required python packages](./requirements.txt) if needed
+
+* **with your suggestions to change the documentation elements**, e.g. `index.rst`
+  * please care that sphinx-based rendering is still working correctly
+
+* **or with combination of both**
+
+
+### Example Data
+
+Our tutorials live from realistic examples and example data.
+
+We recommend: 
+* to upload your example data (preferably as netcdf file) to [zenodo]( https://zenodo.org/ )
+* to label the data such that "tobac" is included in the zenodo title
+
+Already existing `tobac` data can be found here:
+* [**tobac on zenodo**]( https://zenodo.org/search?page=1&size=20&q=tobac )
+