chore: init project

.gitignore

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+# Created by https://www.toptal.com/developers/gitignore/api/rust,rust-analyzer
+# Edit at https://www.toptal.com/developers/gitignore?templates=rust,rust-analyzer
+
+### Rust ###
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+# Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+### rust-analyzer ###
+# Can be generated by other build systems other than cargo (ex: bazelbuild/rust_rules) 
+rust-project.json
+
+
+# End of https://www.toptal.com/developers/gitignore/api/rust,rust-analyzer
+

Cargo.toml

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+[workspace]
+
+members = [
+    "affluences-api",
+]

affluences-api/Cargo.toml

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+[package]
+name = "affluences-api"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+reqwest = { version = "0.11.17", features = ["json"] }
+serde = { version = "1.0.163", features = ["derive"] }

affluences-api/src/lib.rs

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+pub fn add(left: usize, right: usize) -> usize {
+    left + right
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+}