add logo + update README

README.md

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-# test-datasets
+# ![nfcore/test-datasets](docs/images/test-datasets_logo.png)
 Test data to be used for automated testing with the nf-core pipelines
+
+## Introduction
+
+nf-core is a collection of high quality Nextflow pipelines.
+
+## Documentation
+nf-core/test-datasets comes with documentation in the `docs/` directory:
+
+01. [Add a new  test dataset](https://github.com/nf-core/test-datasets/blob/master/docs/ADD_NEW_DATA.md)
+02. [Use an existing test dataset](https://github.com/nf-core/test-datasets/blob/master/docs/USE_EXISTING_DATA.md)
+
+## Support
+
+For further information or help, don't hesitate to get in touch on our [Gitter channel](https://gitter.im/nf-core/Lobby)

docs/ADD_NEW_DATA.md

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+# How to add and use new test dataset
+
+Please fill in the appropriate checklist below (delete whatever is not relevant). These are the most common things requested when adding a new test dataset.
+
+ - [ ] Check [here](https://github.com/nf-core/test-datasets/branches/all) that there isn't already a branch containing data that could be used
+   - If this is the case, follow the [documentation on how to use an existing test dataset](https://github.com/nf-core/test-datasets/blob/master/docs/USE_EXISTING_DATA.md)
+ - [ ] Fork the [nf-core/test-datasets repository](https://github.com/nf-core/nf-core/test-datasets) to your GitHub account
+ - [ ] Create a new branch on your fork
+ - [ ] Add your test dataset
+ - [ ] Make a PR on a new branch with a relevant name
+ - [ ] Wait for the PR to be merged
+ - [ ] Use this newly created branch for your tests

docs/USE_EXISTING_DATA.md

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+# How to use an existing test dataset
+
+Please fill in the appropriate checklist below (delete whatever is not relevant). These are the most common things requested when adding a new test dataset.
+
+ - [ ] Check [here](https://github.com/nf-core/test-datasets/branches/all) to find the branch corresponding to the test dataset you want to use
+ - [ ] Specify in the test.config the path to the files from the test dataset
+ - [ ] Set up your CI tests following the nf-core best practices (cf [.travis.yml template](https://github.com/nf-core/tools/blob/dev/nf_core/pipeline-template/{{cookiecutter.pipeline_slug}}/.travis.yml))