Create pull_request_template.md

Author: oesteban

docs/pull_request_template.md

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+Please make sure you have read the PR guidelines below, and checked all boxes that apply at the bottom.
+
+## Changes proposed in this pull request
+
+**Please describe here the main features / changes proposed for review and integration in fMRIPrep**
+
+If this PR addresses some existing problem, please use GitHub's citing tools (eg. ``ref #``, ``closes #`` or ``fixes #``).
+
+
+
+## Documentation that should be reviewed
+
+Please summarize the main changes to the documentation that the reviewers should be aware of.
+
+## Pull-request guidelines:
+
+1. We invite you to list yourself as a *fMRIPrep* contributor, so if your name 
+   is not already mentioned, please modify the 
+   [``.zenodo.json``](https://github.com/poldracklab/fmriprep/blob/master/.zenodo.json)
+   file with your data right above Russ' entry. Example:
+   ```
+   {
+      "name": "Contributor, New FMRIPrep",
+      "affiliation": "Department of fMRI prep'ing, Open Science Made-Up University",
+      "orcid": "<your id>"
+   },
+   {
+      "name": "Poldrack, Russell A.",
+      "affiliation": "Department of Psychology, Stanford University",
+      "orcid": "0000-0001-6755-0259"
+   },
+   ```
+   
+2. By submitting this request you acknowledge that your contributions are available under the BSD 3-Clause license.
+
+3. Use a descriptive prefix, between brackets for your PR: ``ENH`` (enhancement), ``FIX``, ``TST``, ``DOC``, ``STY``,
+   ``REF`` (refactor), ``WIP`` (Work in progress), ``MAINT`` (maintenance). Example:
+   ```
+   [ENH] Support for SB-reference in multi-band datasets
+   ```
+   Pull-requests tagged with ``[WIP]`` will not merged in until the tag is removed.
+
+4. Your PR will be reviewed following the following
+   [template](https://github.com/poldracklab/fmriprep/wiki/Reviewing-a-Pull-Request).
+
+5. Documentation is a fundamental aspect to the *glass-box* philosophy that *fMRIPrep* abides by.
+   Please understand that the *fMRIPrep* team may (are likely to) request you to improve the documentation
+   provided with this PR, within the PR or in future PRs.
+   
+
+**Please check what corresponds**:
+
+  - [ ] I have read the [community rules for contributions](https://github.com/poldracklab/fmriprep/blob/master/CONTRIBUTING.md).
+  - [ ] I understand that my contributions will not be merged unless the work is
+        finished (i.e. no ``[WIP]`` tag remains in the title of my PR) and tests pass.
+  - [ ] The proposed code follows the
+        [coding guidelines](https://github.com/poldracklab/fmriprep/blob/master/CONTRIBUTING.md#fmriprep-coding-style-guide),
+        to the extent I understood them (and I will address any comments raised by the PR's reviewers in this regard).
+  - [ ] \(Optional\) I opt-out from being listed in the `.zenodo.json` file.