upgrade-instructions: very basic (and generic) instructions on how to…

… upgrade from older to new versions of Uwazi

upgrade-instructions.md

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+# Upgrade instructions
+> **Attention: always make a full backup before upgrading from an older version
+to a new one of Uwazi software.** Tip: the most important parts are MongoDB
+database and the uploaded_documents
+
+At the moment, uwazi-docker has commands that facilitate the first installation
+of the software, but upgrades from an old version of uwazi to a new one that
+involve updating the database **require following official uwazi documentation**.
+
+- See: Upgrading Uwazi and data migrations at <https://github.com/huridocs/uwazi#upgrading-uwazi-and-data-migrations>.
+
+Tip: see docker exec documentation at <https://docs.docker.com/engine/reference/commandline/exec/>
+to undestand how to run commands inside the container that runs the uwazi and
+run the commands that both update database and documents from older to the
+new version.