Add an MIT license and a README to the repository

LICENSE

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+MIT License
+
+Copyright (c) 2026 ruslanty
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

README.md

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+# PHP Runtime Audit
+
+Checks PHP image tags in Dockerfiles and YAML manifests against the fixed
+upstream releases for PHP2Shell (CVE-2026-109618 and CVE-2026-109619).
+
+The scan reads files from disk. It doesn't run the project being scanned or
+connect to its containers or servers.
+
+## Run it
+
+You need PHP 8.5 or later in the 8.x series and Composer 2, or Docker.
+
+With PHP:
+
+```sh
+composer install
+php bin/php-runtime-audit scan /path/to/your/project
+```
+
+Add `--format=json` for JSON output:
+
+```sh
+php bin/php-runtime-audit scan /path/to/your/project --format=json
+```
+
+With Docker:
+
+```sh
+docker build -t php-runtime-audit .
+docker run --rm \
+  -v "/path/to/your/project:/scan:ro" \
+  php-runtime-audit scan /scan
+```
+
+## Results
+
+Each result includes the image tag, file and line, advisory IDs, and a short
+reason. For example:
+
+```text
+Dockerfile:1: POTENTIALLY VULNERABLE php:8.5.11-fpm [CVE-2026-109618, CVE-2026-109619] - Tag is below the fixed release.
+```
+
+- `potentially_vulnerable` means the explicit upstream version is below its
+  fixed release, or its branch has no listed fixed release.
+- `ok` means the tag meets that version threshold. The image itself was not
+  inspected.
+- `unknown` means the image version could not be verified, for example when
+  the image uses a build argument or pinned digest.
+
+JSON output uses `schema_version: 1`. Its `line` field is `null` if the source
+line can't be identified reliably.
+
+Exit codes: `0` no affected or unknown tags; `1` potentially vulnerable tag;
+`2` invalid input or scan error; `3` at least one unknown result and no
+potentially vulnerable result.
+
+## Scope and limits
+
+The catalog uses the [PHP security advisory](https://www.php.net/archive/2026.php#2026-10-21-5).
+The scanner checks Dockerfile `FROM` entries and `image` fields in
+single-document YAML files. A `FROM` entry that uses a build argument is
+reported as `unknown`, even when the argument has a default: `docker build`
+can override that default. Explicit version tags are assessed for `php` and
+`docker.io/library/php`; digest-pinned references are `unknown` because the
+scan doesn't inspect built images or running PHP processes. It also can't
+identify source fixes or vendor backports, or account for OS-package fixes. A
+clean result is not proof that a deployed system is safe.
+
+## Development
+
+Run the project checks with `composer quality`.
+
+The project is licensed under MIT; see [LICENSE](LICENSE).