infection and database architecture setup

Setting up the infection, infection category, antibiotic objects;
infection and category list screens; database architecture.
Merge pull request #2 from yjfJeff/master

hello
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Merge pull request #5 from NaNyanNyan/master

有手机方便多了
infection and database changes
Cloud & local Data Access APIs for infection

Cloud & local Data Access APIs for infection reference
main screen styling
Merge remote-tracking branch 'upstream/master'