Add "Protocols composition" spec

informational/protocol-composition.md

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+---
+title: TEMPLATE
+name: Specification Template
+category: (Standards Track|Informational|Best Current Practice)
+tags: an optional list of tags, not standard
+editor: Jimmy Debe <[email protected]>
+contributors:
+---
+
+### (Info, remove this section)
+
+This section contains meta info about writing specifications.
+This section (including its subsections) MUST be removed.
+
+[COSS](https://rfc.vac.dev/spec/1/) explains the Vac RFC process.
+
+### Tags
+
+The `tags` metadata SHOULD contain a list of tags if applicable.
+
+* `core` for Waku protocol definitions
+* `application` for applications built on top of Waku protocol,
+* `informational` for general guidelines, background information etc. 
+
+## Abstract
+
+
+## Background / Rationale / Motivation
+
+This section serves as an introduction providing background information and a motivation/rationale for the specification.
+
+## Theory / Semantics
+
+This section SHOULD explain in detail how the proposed protocol works.
+It may touch on the wire format where necessary for the explanation.
+This section MAY also specify endpoint behaviour when receiving specific messages, e.g. the behaviour of certain caches etc.
+
+## Wire Format Specification / Syntax
+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 [RFC 2119](https://www.ietf.org/rfc/rfc2119.txt).
+
+This section SHOULD not contain explanations of semantics and focus on concisely defining the wire format.
+Implementations SHOULD adhere to these exact formats to interoperate with other implementations.
+It is fine, if parts of the previous section that touch on the wire format are repeated.
+The purpose of this section is having a concise definition of what an implementation sends and accepts.
+Parts that are not specified here are considered implementation details. 
+Implementors are free to decide on how to implement these details.
+
+
+## Implementation Suggestions (optional)
+An optional *implementation suggestions* section may provide suggestions on how to approach implementation details, and, 
+if available, point to existing implementations for reference.
+
+
+## (Further Optional Sections)
+
+
+## Security/Privacy Considerations
+
+If there are none, this section MAY state that fact.
+This section MAY contain additional relevant information, e.g. an explanation as to why there are no security consideration for the respective document.
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).
+
+## References
+
+A list of references.