clementinecomputing/popufare: Free/libre/open source bus fare system

clementinecomputing 8f51c0d908 sim5320 datasheet and at command set		6 lat temu
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SIM5320_Hardware-Design_V1.07.pdf	8f51c0d908 sim5320 datasheet and at command set	6 lat temu
SIMCOM_SIM5320_ATC_EN_V2.02.pdf	8f51c0d908 sim5320 datasheet and at command set	6 lat temu