readShortLe
Reads a 16-bit signed integer in little-endian order starting at offset.
Little-endian means the least significant byte is stored at the lowest index, so the byte at offset contributes bits 0..7 and the byte at offset + 1 contributes bits 8..15.
Return
the decoded value.
Parameters
offset
the index of the first byte to read.
Throws
if offset is negative or offset + 2 exceeds the array size.