Add the actual code

Author: rklaehn

.github/workflows/rust.yml

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+name: Rust
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Build
+      run: cargo build --verbose
+    - name: Run tests
+      run: cargo test --verbose

Cargo.lock

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+[package]
+name = "nested_enum_utils"
+version = "0.1.0"
+edition = "2021"
+readme = "README.md"
+description = "Macros to provide conversions for nested enums"
+license = "MIT OR Apache-2.0"
+authors = ["Rüdiger Klaehn <rklaehn@protonmail.com>"]
+repository = "https://github.com/n0-computer/nested-enum-utils"
+keywords = ["enum", "conversion", "macros", "protocol"]
+
+[dependencies]
+proc-macro-crate = "3.1.0"
+proc-macro2 = "1.0"
+quote = "1.0"
+syn = { version = "1.0", features = ["full"] }
+
+[lib]
+proc-macro = true
+
+[dev-dependencies]
+trybuild = "1.0.96"