adding code so far

.gitignore

pykat/__init__.py

pykat/colours.py

pykat/commands.py

pykat/components.py

pykat/detectors.py

pykat/finesse.py

pykat/gui/__init__.py

pykat/gui/graphics.py

pykat/gui/gui.py

pykat/gui/qt_gui.py

pykat/gui/qt_gui.ui

pykat/gui/resources.py

pykat/gui/resources.qrc

pykat/gui/resources/beamsplitter.svg

pykat/gui/resources/laser.svg

pykat/gui/resources/mirror_curve.svg

pykat/gui/resources/mirror_flat.svg

pykat/gui/resources/photodiode_green.svg

pykat/gui/resources/photodiode_red.svg