Added String Read/Write capability, Minor rewrites#4

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Commits on Aug 6, 2019

changed README format + added instructions for not installing the library
Simon Kolotov
committed
Protocol is now an enum rather than a define
Simon Kolotov
committed
Crystal frequency is now a property rather than a define
Simon Kolotov
committed
Added writeString and readString capability
Simon Kolotov
committed
clearing up compilation warnings
Simon Kolotov
committed