Add an example for tomlgen_rust features

Author: Martin Larralde

example_tomlgen/.gitignore

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+build/
+Cargo.toml
+Cargo.lock

example_tomlgen/README.rst

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+`example_tomlgen`
+=================
+
+An example extensions with automatically generated ``Cargo.toml`` manifest
+files.

example_tomlgen/hello/__init__.py

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+# coding: utf-8
+
+from . import french
+from . import english

example_tomlgen/hello/english/lib.rs

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+#![feature(proc_macro)]
+
+extern crate pyo3;
+
+use pyo3::prelude::*;
+
+/// Module documentation string
+#[py::modinit(english)]
+fn init(py: Python, m: &PyModule) -> PyResult<()> {
+
+    #[pyfn(m, "hello")]
+    fn hello(_py: Python) -> PyResult<()> {
+        println!("Hello, world!");
+        Ok(())
+    }
+
+    Ok(())
+}

example_tomlgen/hello/french/lib.rs

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+#![feature(proc_macro)]
+
+extern crate pyo3;
+
+use pyo3::prelude::*;
+
+/// Module documentation string
+#[py::modinit(french)]
+fn init(py: Python, m: &PyModule) -> PyResult<()> {
+
+    #[pyfn(m, "hello")]
+    fn hello(_py: Python) -> PyResult<()> {
+        println!("Bonjour, monde!");
+        Ok(())
+    }
+
+    Ok(())
+}

example_tomlgen/setup.cfg

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+[metadata]
+author_email = "[email protected]"
+
+[tomlgen_rust]
+create_workspace = true
+
+[tomlgen_rust.dependencies]
+pyo3 = { version = "*", features = ["extension-module"] }
+
+[aliases]
+build_rust = tomlgen build_rust

example_tomlgen/setup.py

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+import setuptools
+import setuptools_rust as rust
+
+
+setuptools.setup(
+    name='hello-rust',
+    version='0.1.0',
+    author="Martin Larralde",
+
+    # Find all inplace extensions
+    rust_extensions=rust.find_rust_extensions(
+        binding=rust.Binding.PyO3,
+        strip=rust.Strip.Debug,
+    ),
+
+    # rust extensions are not zip safe, just like C-extensions.
+    zip_safe=False
+)