Restructure project directories

Follow the standard of all go projects

internal/commands/command.go

@@ -0,0 +1,15 @@
+package commands
+
+import (
+	"gitlab.com/revalus/grm/internal/config"
+)
+
+type Command interface {
+	Command(repoCfg config.RepositoryConfig) CommandStatus
+}
+type CommandStatus struct {
+	Name    string
+	Changed bool
+	Message string
+	Error   bool
+}