ADR-23 JetStream Simplified API

adr/ADR-23.md

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+# JetStream Simplified Client API 
+
+|Metadata| Value             |
+|--------|-------------------|
+|Date    | 2022-06-27        |
+|Author  | @aricart, @tbeets |
+|Status  | Proposed          |
+|Tags    | jetstream, client |
+
+## Context and Problem Statement
+
+JetStream implements signaling choreography between client and server to affect the lifecycle
+of streams and stream consumers and implement At-Least-Once message publishing and delivery end-to-end. 
+
+An app developer could implement and use JetStream leveraging only NATS pub-sub "core" primitives, but this would not be
+productive for typical application development, thus NATS client libraries have been enhanced with JetStream
+methods and abstractive helper features. 
+
+With community uptake and learnings, it's clear that first-generation client library abstractions are of the "leaky" variety, requiring the app developer to
+have both intimate knowledge of low-level JetStream architecture and choreography semantics on the one hand **and** obscuring some 
+runtime actions in others, often causing developer confusion and misunderstanding.
+
+## [Context | References | Prior Work]
+
+[What does the reader need to know before the design. These sections and optional, can be separate or combined.]
+
+## Design
+
+[If this is a specification or actual design, write something here.]
+
+## Decision
+
+[Maybe this was just an architectural decision...]
+
+## Consequences
+
+[Any consequences of this design, such as breaking change or Vorpal Bunnies]