Add UPGRADE.md

UPGRADE.md

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+Upgrading this plugin
+=====================
+
+This is an internal documentation for plugin developers with some notes what has to be considered when updating this plugin to a new Moodle major version.
+
+General
+-------
+
+* Generally, this is a quite simple plugin with just one purpose.
+* It does not rely on any fluctuating library functions and should remain quite stable between Moodle major versions.
+* Thus, the upgrading effort is low.
+
+
+Upstream changes
+----------------
+
+* This plugin does not inherit or copy anything from upstream sources.
+
+
+Automated tests
+---------------
+
+* Due to the fact that the plugin mainly offers webservice endpoints to an external application, there aren't any automated test (yet).
+
+Manual tests
+------------
+
+* Manual tests are carried out by SEMCO staff.