Implemented run command

src/build/errors/UnknownCLIParameter.go

@@ -0,0 +1,13 @@
+package errors
+
+import "fmt"
+
+// UnknownCLIParameter error is created when a command line parameter is not recognized.
+type UnknownCLIParameter struct {
+	Parameter string
+}
+
+// Error generates the string representation.
+func (err *UnknownCLIParameter) Error() string {
+	return fmt.Sprintf("Unknown parameter '%s'", err.Parameter)
+}