Create RELEASE.md

RELEASE.md

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+## Release Checklist
+
+Checklist of steps to perform at each code release
+
+### Update Version String
+
+Update `INVENTREE_SW_VERSION` in [version.py](https://github.com/inventree/InvenTree/blob/master/InvenTree/InvenTree/version.py)
+
+### Increment API Version
+
+If the API has changed, ensure that the API version number is incremented.
+
+### Translation Files
+
+Merge the crowdin translation updates into master branch
+
+### Documentation Release
+
+Create new release for the [inventree documentation](https://github.com/inventree/inventree-docs)
+
+### Python Library Release
+
+Create new release for the [inventree python library](https://github.com/inventree/inventree-python)