Create PULL_REQUEST_TEMPLATE.md

Author: satra

.github/PULL_REQUEST_TEMPLATE.md

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+Pull-request guidelines (Remove this section after reading):
+
+1. If you would like to list yourself as a Nipype contributor and your name is not mentioned please modify .zenodo.json file.
+2. By submitting this request you acknowledge that your contributions are available under the Apache 2 license.
+3. Use a descriptive prefix for your PR: ENH (enhancement), FIX, TST, DOC, STY, REF (refactor), WIP (Work in progress)
+4. The person who accepts/merges your PR will include an update to the CHANGES file: prefix: description (URL of pull request)
+5. Run `make check-before-commit` before submitting the PR.
+
+----- REMOVE TILL HERE -----
+
+Fixes # .
+
+Changes proposed in this pull request
+-
+-