Created architecture.md

architecture.md

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+![image](https://github.com/fsprojects/pulsar-client-dotnet/assets/3329606/a7dc577e-beed-4208-818e-fe799f058637)
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+Architecturally pulsar-client-dotnet is a series of actors that send messages to each other. Each of them uses [Unbounded Channel](https://devblogs.microsoft.com/dotnet/an-introduction-to-system-threading-channels/) as a message queue and processes messages one by one in loop.
+Actors communicate with each other by sending messages between each other. Messages are modeled as [discriminated unions](https://learn.microsoft.com/en-us/dotnet/fsharp/language-reference/discriminated-unions)
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+Connections to broker are reused (one connection per server) between producers and consumers. 
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+PulsarClient class serves as un umbrella class and stores reference to all other entities, i.e. consumers, producers, connection pool, lookup service and schema providers