[WIP] Add Apache-2.0 LICENSE

[Copilot]

• Explore repository structure
• Create LICENSE file with Apache-2.0 content (copyright: shinemoon, year: 2026)
• Add License section to README.md
• Run code review and security check

Original prompt

在仓库 shinemoon/M5ReadPaper 的分支 main 基础上创建一个新分支 add-apache2-license，并在该分支中添加/修改以下文件，然后创建一个 Pull Request（标题："Add Apache-2.0 LICENSE"）。

变更内容（要创建的文件及其内容）：

1. LICENSE（仓库根目录） — 使用 Apache License 2.0 标准全文，版权持有人设置为 shinemoon，年份 2026；文件末尾包含 SPDX 标识。

文件内容如下（请按原样写入 LICENSE 文件）：

                             Apache License
                       Version 2.0, January 2004
                    http://www.apache.org/licenses/

TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

1. Definitions.

   "License" shall mean the terms and conditions for use, reproduction,
   and distribution as defined by Sections 1 through 9 of this document.

   "Licensor" shall mean the copyright owner or entity authorized by
   the copyright owner that is granting the License.

   "Legal Entity" shall mean the union of the acting entity and all
   other entities that control, are controlled by, or are under common
   control with that entity. For the purposes of this definition,
   "control" means (i) the power, direct or indirect, to cause the
   direction or management of such entity, whether by contract or
   otherwise, or (ii) ownership of fifty percent (50%) or more of the
   outstanding shares, or (iii) beneficial ownership of such entity.

   "You" (or "Your") shall mean an individual or Legal Entity
   exercising permissions granted by this License.

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   including but not limited to software source code, documentation
   source, and configuration files.

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   transformation or translation of a Source form, including but
   not limited to compiled object code, generated documentation,
   and conversions to other media types.

   "Work" shall mean the work of authorship, whether in Source or
   Object form, made available under the License, as indicated by a
   copyright notice that is included in or attached to the work
   (an example is provided in the Appendix below).

   "Derivative Works" shall mean any work, whether in Source or Object
   form, that is based on (or derived from) the Work and for which the
   editorial revisions, annotations, elaborations, or other modifications
   represent, as a whole, an original work of authorship. For the purposes
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   separable from, or merely link (or bind by name) to the interfaces of,
   the Work and Derivative Works thereof.

   "Contribution" shall mean any work of authorship, including the
   original version of the Work and any modifications or additions
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   "Contributor" shall mean Licensor and any individual or Legal Entity
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2. Grant of Copyright License. Subject to the terms and conditions of
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   with the Work to which such Contribution(s) was submitted. If You
   institute patent litigation against any entity (including a
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   or a Contribution incorp...

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