add 11 models

created FreeCAD models:

• Button_Switch_SMD.3dshapes/Panasonic_EVQP3_EVQ9P.FCStd
• Connector_Hirose.3dshapes/Hirose_DF13_DF13A-4P-1.25H_1x04_P1.25mm_Horizontal.FCStd *1
• Connector_Molex.3dshapes/Molex_Pico-Clasp_202396-0407_1x04-1MP_P1.00mm_Horizontal.FCStd *1
• Connector_RJ.3dshapes/RJ45_Weidmueller_1433890000_RJ45C5_S1D_2.7N4N_RL.FCStd
• Connector_USB.3dshapes/USB_Micro-B_Amphenol_10118194.FCStd
• Connector_USB.3dshapes/USB_Micro-B_FischerElektronik_USB_MC_2_B_SMD.FCStd
• LED_SMD.3dshapes/LED_Inolux_IN-PI20TBT5R5G5B.FCStd
• LED_SMD.3dshapes/LED_Osram_LRTB_R48G.FCStd
• LED_SMD.3dshapes/Vishay_VSMB294008G.FCStd
• OptoDevice.3dshapes/Vishay_Panhead-4PIN.FCStd
• RF_Module.3dshapes/ESP32-C3-WROOM-02.FCStd

*1 these should be better done with a script generating the full series. i just needed a fast way to do it....

additionally i have added

• gitignore: some FreeCAD backup file endings
• readme: links to FreeCAD and StepUp

i will add merge requests for the models and footprints..

please let me know of anything that needs to be changed for inclusion! i will do the needed changes as soon as possible.