Add warning note about database incompatibilty to MMEX Android github repo

[tactilis]

The Android app README.md here https://github.com/moneymanagerex/android-money-manager-ex states:

"Money Manager Ex for Android is a mobile companion to PC/desktop personal finance applications currently available for Windows, Mac OSX and LINUX. It can be used with the same database used by MoneyManagerEx Desktop, or as an addition to GnuCash or other applications that import transactions via .qif files."

I think a note should be added along the lines of:

"NOTE: The Android app is compatible with the Money Manager Ex database for versions of the desktop application up to 1.5.21 only. It is not compatible with v1.6.0 or later."

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[github-actions]

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