Add soil source to sources.json
Add soil source to sources.json

ITatJCU/iot-dataflow-graph-server,adamrehn/iot-dataflow-graph-server,adamrehn/iot-dataflow-graph-server,ITatJCU/iot-dataflow-graph-server,ITatJCU/iot-dataflow-graph-server,adamrehn/iot-dataflow-graph-server