Create UPGRADE7.md

Author: codeconsole

UPGRADE7.md

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+# Common 7.0 Upgrade Gotchas
+
+Experienced while upgrading modules for Grails 7
+
+- h2 2.x is stricter about reserved words
+  - https://github.com/grails/gorm-hibernate5/pull/910/commits/c8de45df204966ccc228b46b94beeb2142ae0f59 
+- GROOVY-10621 
+  - Primitive booleans will no longer generate the form of isProperty & getProperty.  They will only generate isProperty()
+- GROOVY-5169
+  - Fields with a public modifier were not considered a property in groovy 3, but are now.