Add buf.md for proto API docs

In this file a module description could be added as exaplained here: https://docs.buf.build/bsr/documentation
CosmWasm · Feb 14, 2022 · 37cb12a · 37cb12a
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+# Protobufs
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+This is the public protocol buffers API for [Wasmd](https://github.com/CosmWasm/wasmd).