Add initial files to repo

Author: heiglandreas

meta.md

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+# Attributes Meta Document
+
+## 1. Summary
+
+This Working Group aims to create and manage a shared set of PHP attributes that may be used by many different actors within the PHP ecosystem, avoiding duplication and redundancy.
+
+## 2. Why Bother?
+
+Right now libraries that want to use attributes either have to define them themselves or rely upon
+another library that has them defined. Most of the time that also means to import all the code of
+the other library.
+
+Userland libraries have no interest in provising an interoperable set of attributes as they solve
+a specific problem with *their* set of attributes.
+
+An interoperable shared registry with attribute definitions will solve this.
+
+## 3. Scope
+
+### 3.1 Goals
+
+* Define and maintain a set of attribute definitions that are relevant for a reasonably broad portion of the PHP ecosystem so that different tools and users can use and rely upon a defined set of attributes with less duplication.
+* Provide one or multiple composer-installable packages containing
+  the code for the attributes in the registry
+* provide methods to maintain the registry and add, modify and remove attributes from it
+
+### 3.2 Non-Goals
+
+* The goal is **not** to provide a registry of **all** attributes available in PHP. As an example: The ORM-specific
+  attributes from Doctrine are likely not to be part of this registry as they are specific to the library itself.
+
+## 4. Approaches
+
+TBD
+
+
+## 5. People
+
+### 5.1 Editor
+
+* Andreas Heigl
+
+### 5.2 Sponsor
+
+* Vincent de Lau
+
+### 5.3 Working group members
+
+* Juliette Reinders-Folmer
+* Jaap van Otterdijk
+* Larry Garfield
+
+## 6. Votes
+
+* [Entrance Vote](https://groups.google.com/g/php-fig/)
+* [Acceptance Vote](https://groups.google.com/g/php-fig/)
+
+## 7. Relevant Links
+
+
+## 8. Past contributors
+
+This document stems from the work of many people in previous years, we recognize their effort:
+
+*
+_**Note:** Order descending chronologically._
+
+## 9. FAQ
+
+TBD

spec.md

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+# Attributes
+
+The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL
+NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED",
+"MAY", and "OPTIONAL" in this document are to be interpreted as
+described in [BCP 14][] [[RFC 2119][]] [[RFC 8174][]] when, and only when, they
+appear in all capitals, as shown here.
+
+[BCP 14]: https://datatracker.ietf.org/doc/html/bcp14/
+[RFC 2119]: https://datatracker.ietf.org/doc/html/rfc2119
+[RFC 8174]: https://datatracker.ietf.org/doc/html/rfc8174
+
+## Overview
+