net-ppp: Add it.

embassy-net-ppp/README.md

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+# `embassy-net-ppp`
+
+[`embassy-net`](https://crates.io/crates/embassy-net) integration for PPP over Serial.
+
+## Interoperability
+
+This crate can run on any executor.
+
+It supports any serial port implementing [`embedded-io-async`](https://crates.io/crates/embedded-io-async).
+
+## License
+
+This work is licensed under either of
+
+- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or
+  http://www.apache.org/licenses/LICENSE-2.0)
+- MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.