Add go mod

Author: Keda87

go.mod

@@ -0,0 +1,16 @@
+module github.com/go-oauth2/mysql
+
+go 1.14
+
+require (
+	github.com/go-gorp/gorp v2.2.0+incompatible // indirect
+	github.com/go-oauth2/oauth2/v4 v4.1.1
+	github.com/go-sql-driver/mysql v1.5.0
+	github.com/json-iterator/go v1.1.10
+	github.com/lib/pq v1.7.0 // indirect
+	github.com/mattn/go-sqlite3 v1.14.0 // indirect
+	github.com/poy/onpar v1.0.0 // indirect
+	github.com/smartystreets/goconvey v1.6.4
+	github.com/ziutek/mymysql v1.5.4 // indirect
+	gopkg.in/gorp.v2 v2.2.0
+)