Add simple example hello.

[jmjoy]

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license-eye has totally checked 179 files.

Valid	Invalid	Ignored	Fixed
110	1	68	0

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• examples/hello/src/lib.rs

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Suggested change

	use phper::{echo, functions::Argument, modules::Module, php_get_module, values::ZVal};
	// Copyright (c) 2022 PHPER Framework Team
	// PHPER is licensed under Mulan PSL v2.
	// You can use this software according to the terms and conditions of the Mulan PSL v2.
	// You may obtain a copy of Mulan PSL v2 at:
	// http://license.coscl.org.cn/MulanPSL2
	// THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
	// EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
	// MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
	// See the Mulan PSL v2 for more details.
	use phper::{echo, functions::Argument, modules::Module, php_get_module, values::ZVal};