Create pull_request_template.md (#1157)

Adds some guidance on how to edit/create intel modules

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Co-authored-by: Alex Chantavy <[email protected]>

.github/pull_request_template.md

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+### Summary
+> Describe your changes.
+
+
+
+### Related issues or links
+> Include links to relevant issues or other pages.
+
+- https://github.com/lyft/cartography/issues/...
+
+
+### Proof that this works
+> We can merge your change in faster if we see that it works. For example, if making a change to the graph, include a
+> screenshot showing what the graph looked like before and after your changes. You can also include console log traces
+> showing what happened before and after your changes.
+
+
+
+### Checklist
+
+- [ ] Update/add unit or integration tests
+
+If you are modifying or implementing an intel module:
+- [ ] Update the [schema](https://github.com/lyft/cartography/tree/master/docs/root/modules) and [readme](https://github.com/lyft/cartography/blob/master/docs/schema/README.md)
+- [ ] Use the NodeSchema [data model](https://lyft.github.io/cartography/dev/writing-intel-modules.html#defining-a-node)