Move rust crates down near the protobufs

The rust crates are interleaved in the protobuf directories. This
prevents mirroring the directory structure in another sub-directory

crates/Cargo.toml → Cargo.toml

@@ -1,8 +1,8 @@
 [workspace]
 members = [
-    "attestation/grpcio",
-    "attestation/tonic",
-    "attestation/protobuf-types",
+    "mobilecoinfoundation/attestation/grpcio",
+    "mobilecoinfoundation/attestation/tonic",
+    "mobilecoinfoundation/attestation/messages",
 ]
 
 # We need to explicitly specify resolver 2.

README.md

@@ -1,3 +1,12 @@
-# protobufs
+# Rust crates for gRPC interfaces
 
-MobileCoin Protocol Buffers Definitions (Future)
+This is composed of 3 crates:
+
+1. `mc-probufs-tonic`: A crate providing a
+   [Tonic](https://docs.rs/tonic/latest/tonic/) implementation of gRPC client
+   and server services.
+2. `mc-probufs-grpcio`: A crate providing a
+   [grpcio](https://docs.rs/grpcio/latest/grpcio/) implementation of gRPC client
+   and server services.
+3. `mc-probufs-messages`: A crate providing gRPC messages. This is used by
+   both of the service implementations, `mc-probufs-tonic` and `mc-probufs-grpcio`.

crates/attestation/grpcio/Cargo.toml → mobilecoinfoundation/attestation/grpcio/Cargo.toml

@@ -12,4 +12,4 @@ categories = ["api-bindings", "encoding"]
 keywords = ["grpc", "protobuf", "rpc"]
 
 [dependencies]
-mc-attestation-protobuf-types = { path = "../protobuf-types", version = "0.1.0" }
+mc-attestation-messages = { path = "../messages", version = "0.1.0" }

crates/attestation/protobuf-types/Cargo.toml → mobilecoinfoundation/attestation/messages/Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "mc-attestation-protobuf-types"
+name = "mc-attestation-messages"
 version = "0.1.0"
 edition = "2021"
 authors = ["MobileCoin"]

crates/attestation/tonic/Cargo.toml → mobilecoinfoundation/attestation/tonic/Cargo.toml

@@ -12,4 +12,4 @@ categories = ["api-bindings", "encoding"]
 keywords = ["grpc", "protobuf", "rpc"]
 
 [dependencies]
-mc-attestation-protobuf-types = { path = "../protobuf-types", version = "0.1.0" }
+mc-attestation-messages = { path = "../messages", version = "0.1.0" }