Add mc-sgx-sync crate

.github/CODEOWNERS

@@ -2,6 +2,7 @@
 /.github/       @jcape @nick-mobilecoin
 /io/            @nick-mobilecoin
 /panic/         @nick-mobilecoin
+/sync/          @nick-mobilecoin
 /test_enclave/  @nick-mobilecoin
 /LICENSE        @jcape
 /*.*            @jcape

Cargo.toml

@@ -3,7 +3,8 @@ members = [
     "alloc",
     "io",
     "io/untrusted",
-    "panic"
+    "panic",
+    "sync",
 ]
 exclude = [
     "panic/abort",

sync/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "mc-sgx-sync"
+version = "0.1.0"
+edition = "2021"
+authors = ["MobileCoin"]
+rust-version = "1.62.1"
+license = "Apache-2.0"
+readme = "README.md"
+repository = "https://github.com/mobilecoinfoundation/sgx-std"
+description = "Synchronization primitives for SGX enclaves"
+categories = ["hardware-support", "no-std"]
+keywords = ["sgx", "no-std"]
+
+[dependencies]

sync/README.md

@@ -0,0 +1,21 @@
+# MobileCoin: Synchronization primitives for SGX enclaves
+
+[![Project Chat][chat-image]][chat-link]<!--
+-->![License][license-image]<!--
+-->![Target][target-image]<!--
+-->[![Crates.io][crate-image]][crate-link]<!--
+-->[![Docs Status][docs-image]][docs-link]<!--
+-->[![Dependency Status][deps-image]][deps-link]
+
+Synchronization primitives for SGX enclaves
+
+[chat-image]: https://img.shields.io/discord/844353360348971068?style=flat-square
+[chat-link]: https://mobilecoin.chat
+[license-image]: https://img.shields.io/crates/l/mc-sgx-sync?style=flat-square
+[target-image]: https://img.shields.io/badge/target-sgx-red?style=flat-square
+[crate-image]: https://img.shields.io/crates/v/mc-sgx-sync.svg?style=flat-square
+[crate-link]: https://crates.io/crates/mc-sgx-sync
+[docs-image]: https://img.shields.io/docsrs/mc-sgx-sync?style=flat-square
+[docs-link]: https://docs.rs/crate/mc-sgx-sync
+[deps-image]: https://deps.rs/crate/mc-sgx-sync/0.1.0/status.svg?style=flat-square
+[deps-link]: https://deps.rs/crate/mc-sgx-sync/0.1.0

sync/src/lib.rs

@@ -0,0 +1,4 @@
+// Copyright (c) 2023 The MobileCoin Foundation
+
+#![doc = include_str!("../README.md")]
+#![deny(missing_docs, missing_debug_implementations, unsafe_code)]