Add attributes-meta document

This is a first draft to get the whole PER process started

Author: heiglandreas

proposed/attributes-meta.md

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+# Attributes Meta Document
+
+## 1. Summary
+
+The idea is to create a registry that holds and provides user-space attributes for PHP.
+
+This Proposal is about defining the registry and the workflows to add, modify and 
+remove attributes from that registry
+
+## 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. 
+
+This registry shall solve that
+
+## 3. Scope
+
+### 3.1 Goals
+
+* Define and maintain a set of attributes that are relevant for more than one
+  single tool so that different tools can use and rely upon a defined set of attributes and
+  users do not need to use several similar attributes with the same meaning for different tools.
+* 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
+
+ * TBD
+
+### 5.2 Sponsor
+
+ * TBD
+
+### 5.3 Working group members
+
+ * Juliette Reinders-Folmer
+ * Jaap vsn Otterdijk
+ * Vincent de Lau
+ * Larry Garfield
+ * Andreas Heigl
+
+## 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