PR template

.github/PULL_REQUEST_TEMPLATE.md

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+Please sign (check) the below before submitting the Pull Request:
+
+- [ ] I have signed the ntop Contributor License Agreement at https://github.com/ntop/legal/blob/main/individual-contributor-licence-agreement.md
+- [ ] I have read the contributing guide lines at https://github.com/ntop/nDPI/blob/dev/CONTRIBUTING.md
+- [ ] I have updated the documentation (in doc/) to reflect the changes made (if applicable)
+
+Link to the related [issue](https://github.com/ntop/nDPI/issues):
+
+
+Describe changes:
+
+