Add rust bindings

.gitignore

@@ -57,3 +57,7 @@ onnxruntime/python/version_info.py
 # clangd
 .cache/
 compile_commands.json
+# Rust specific
+rust/**/target
+rust/**/Cargo.lock
+rust/onnxruntime/synset.txt

rust/BUILD.md

@@ -0,0 +1,48 @@
+# Building and testing the Rust bindings
+
+These instructions require cargo and rustc.
+To get these follow the instructions at [https://rustup.rs](https://rustup.rs)
+The instructions compile the onnxruntime along with the bindings,
+so require `cmake`, a python 3 interpreter, clang (needed to parse the C headers to generate the Rust bindings),
+and the platform compiler to compile onnxruntime.
+
+## Local setup of onnxruntime repo
+
+```sh
+    git clone https://github.com/microsoft/onnxruntime
+    cd onnxruntime
+    git submodule update --init --recursive
+```
+
+## cargo build both crates
+
+from the root of onnxruntime repo
+
+```sh
+    CARGO_TARGET_DIR=build/rust cargo build --manifest-path rust/Cargo.toml
+```
+
+The CARGO_TARGET_DIR environment variable puts the build artifacts in `onnxruntime/build/rust`
+instead of `onnxruntime/rust/target`.
+
+## cargo test both crates
+
+```sh
+    CARGO_TARGET_DIR=build/rust cargo test --manifest-path rust/Cargo.toml --features model-fetching
+```
+
+### cargo test both crates while specifying the absolute path to the OnnxRuntime shared library.
+
+```sh
+    RUST_ONNXRUNTIME_LIBRARY_PATH=<absolute path to shared library/libonnxruntime.so> CARGO_TARGET_DIR=build/rust cargo test --manifest-path rust/Cargo.toml --features model-fetching
+```
+
+## cargo test with sanitizer support
+
+**If you are using a nightly Rust compiler and are on one the platforms listed in [Rust sanitizer support](https://doc.rust-lang.org/beta/unstable-book/compiler-flags/sanitizer.html).**
+
+where `$SAN` is one of `address`, `thread`, `memory` or `leak`
+
+```sh
+    RUSTFLAGS="-Zsanitizer=$SAN" CARGO_TARGET_DIR=build/rust cargo test --manifest-path rust/Cargo.toml --features model-fetching --target <your target for example x86_64-unknown-linux-gnu> -Z build-std -- --test-threads=1
+```

rust/Cargo.toml

@@ -0,0 +1,5 @@
+[workspace]
+members = [
+    "onnxruntime-sys",
+    "onnxruntime",
+]

rust/LICENSE-APACHE

@@ -0,0 +1,201 @@
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rust/LICENSE-MIT

@@ -0,0 +1,21 @@
+MIT License
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