work on generating main.go and use config not hardcoded vals

config.go

@@ -1,6 +1,8 @@
 package tuugen
 
 import (
+	"path/filepath"
+
 	"gopkg.in/yaml.v2"
 )
 
@@ -9,9 +11,14 @@ type Config struct {
 	ServiceName string      `yaml:"service_name"`
 	ImportPath  string      `yaml:"import_path"`
 	ProtoFile   string      `yaml:"proto_file"`
+	GRPCFile    string      `yaml:"grpc_file"`
 	DataModels  []DataModel `yaml:"data_models"`
 }
 
+func (c Config) GRPCPath() string {
+	return filepath.Dir(c.GRPCFile)
+}
+
 func YamlToConfig(b []byte) (Config, error) {
 	cfg := Config{}
 	err := yaml.Unmarshal(b, &cfg)