Merge pull request #588 from Shopify/lindadamus/add_multiclass_discounts

Add template code for multi-class discounts in rust

Author: jonathanhamel4

discounts/rust/discounts/default/.gitignore

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+/target
+Cargo.lock

discounts/rust/discounts/default/Cargo.toml.liquid

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+[package]
+name = "{{handle | replace: " ", "-" | downcase}}"
+version = "1.0.0"
+edition = "2021"
+rust-version = "1.84"
+
+[dependencies]
+serde = { version = "1.0.13", features = ["derive"] }
+serde_json = "1.0"
+shopify_function = "0.8.1"
+graphql_client = "0.14.0"
+
+[profile.release]
+lto = true
+opt-level = 'z'
+strip = true

discounts/rust/discounts/default/README.md

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+# Shopify Function development with Rust
+
+## Dependencies
+
+- [Install Rust](https://www.rust-lang.org/tools/install)
+  - On Windows, Rust requires the [Microsoft C++ Build Tools](https://docs.microsoft.com/en-us/windows/dev-environment/rust/setup). Be sure to select the _Desktop development with C++_ workload when installing them.
+
+## Building the function
+
+You can build this individual function using `cargo build`.
+
+```shell
+cargo build --target=wasm32-wasip1 --release
+```
+
+The Shopify CLI `build` command will also execute this, based on the configuration in `shopify.extension.toml`.

discounts/rust/discounts/default/locales/en.default.json.liquid

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+{
+  "name": "{{name}}",
+  "description": "{{name}}"
+}