added load average calculations and moved the testing from main to their own cli commands

internal/errors/errors.go

@@ -0,0 +1,13 @@
+package errors
+
+func New(text string) error {
+	return &errorString{text}
+}
+
+type errorString struct {
+	s string
+}
+
+func (e *errorString) Error() string {
+	return e.s
+}