lib rlp.cr v0.1.0

initial release for the rlp crystal library.

this library allows for rlp-encoding of:

• binary data (assumed encoded)
• boolean values (true, false)
• scalars (positive integers)
• string literals and characters
• arrays containing any of the the above
• nested arrays containing any of the above

rlp decoding is not yet implemented.

changes:

• add utils for converting between data types ef496ac
• get length of input data from prefix byte 88e73c2
• rlp encoding of bytes, arrays, strings, scalars, and booleans #1