Created Seaweed Message Queue (markdown)

Seaweed-Message-Queue.md

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+# Introduction
+
+# Architecture
+
+The structured messages are published to message brokers, persisted to SeaweedFS, and consumed by message subscribers. To simplify client libraries, a messaging agent with gRPC APIs is added for easier message publishing and subscribing.
+```
+  Publishers => gRPC Publish APIs => Agent => Brokers => Agent => gRPC Subscribe APIs => Subscribers
+                                                 ^
+                                                 |
+                                                 v
+                                             SeaweedFS
+```
+
+The Agent can be run either on the server side, or as a sidecar on each client.
+
+# Features
+* Structured Messages: SeaweedFS is to store unstructured data files. Seaweed Message Queue is to store structured messages.
+* The messages stored on SeaweedFS can be converted into Parquet files, saving disk spaces with more efficient columnar compression. 
+* The Parquet files can be consumed in streams via Seaweed messaging brokers.
+* The Parquet files can be read in batches directly via SeaweedFS.
+* Message published successfully are acknowledged, or receive an error if not successful.
+* Message consume offsets are tracked and persisted.
+* Consumer APIs can process messages in multi-threads while still ensuring serial processing the same message key.