Update READMEs

Author: stephaneyfx

README.md

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+enum-iterator/README.md

README.md

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+<!-- cargo-sync-readme start -->
+
+# Overview
+- [📦 crates.io](https://crates.io/crates/enum-iterator-derive)
+- [📖 Documentation](https://docs.rs/enum-iterator-derive)
+- [⚖ 0BSD license](https://spdx.org/licenses/0BSD.html)
+
+Procedural macro to derive `IntoEnumIterator` for field-less enums.
+
+See crate [enum-iterator](https://docs.rs/enum-iterator) for details.
+
+# Contribute
+All contributions shall be licensed under the [0BSD license](https://spdx.org/licenses/0BSD.html).
+
+<!-- cargo-sync-readme end -->

enum-iterator-derive/README.md

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+<!-- cargo-sync-readme start -->
+
+# Overview
+- [📦 crates.io](https://crates.io/crates/enum-iterator)
+- [📖 Documentation](https://docs.rs/enum-iterator)
+- [⚖ 0BSD license](https://spdx.org/licenses/0BSD.html)
+
+Tools to iterate over the variants of a field-less enum.
+
+See the `IntoEnumIterator` trait.
+
+# Example
+```rust
+use enum_iterator::IntoEnumIterator;
+
+#[derive(Debug, IntoEnumIterator, PartialEq)]
+enum Day { Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday }
+
+fn main() {
+    assert_eq!(Day::into_enum_iter().next(), Some(Day::Monday));
+    assert_eq!(Day::into_enum_iter().last(), Some(Day::Sunday));
+}
+```
+
+# Contribute
+All contributions shall be licensed under the [0BSD license](https://spdx.org/licenses/0BSD.html).
+
+<!-- cargo-sync-readme end -->