Adds steps logic for the register form.

addons/godot-form-validator/rules/numeric_rule.gd

@@ -0,0 +1,16 @@
+@tool
+extends ValidatorRule
+class_name NumericRule
+
+
+func _init() -> void:
+	fail_message = "Value must contain only numbers."
+
+
+func apply(control: Control, value) -> RuleResult:
+	var result = RuleResult.new()
+	if value is String:
+		result.passed = ValidatorFunctions.empty(value) or ValidatorFunctions.numeric(value)
+	if not result.passed:
+		result.message = fail_message
+	return result