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README.md

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+### INSTALL goctl
+GO111MODULE=on go get -u git.i2edu.net/i2/go-zero/tools/goctl
+
+### GEN API CODE
+goctl api go -api i2bill.api -dir .
+
+### GEN MODEL
+goctl model mysql ddl -c -src model/user.sql -dir model
+
+### RUN API GATEWAY
+go run i2bill.go -f etc/i2bill-api.yaml