Added coin-cell battery holder
Added anntenna footprint
Added more datasheets
schematic: Added coin cell battery holder
datasheets/Balun/748421245.pdf
schematic: fixed non-connected nets in JTAG-connector
footprint: changed pin 9 to pin 8
readme.md: added design rules
Added path to configuration files
QFN-footprint: Fixed pin-width so it matches datasheet
Datasheets: Added QFN footprint guide
Merge branch 'master' of https://github.com/rajtantajtan/ATmega256rfr2
schematics: Corrected schematics according to guidelines in Design checklist document. This includes terminiting unused pins and removed capacitors on antenna output and added one capacitor on unbalanced antenna output and DC-feed.
Fixed paths and instructions
footprint: Fixed soldermask on SHT21-footprint
footprint: removed lines that were crossing solderpads
Added SMD  CR2450 coin cell battery holder
Footprint: Added more detailed silkmask to coincell holder
Added datasheet for another coincell batteryholder
footprint: Removed silkscreen from balun footprint and fixed pitch according to recommendations in datasheet