[esp] Add Rust example with std.

esp/rust/README.md

@@ -0,0 +1,13 @@
+# esp/rust
+
+```bash
+shaunrd0/klips/esp/rust
+├── 01_es-idf-std   # Template project for using ESP-IDF with std enabled.
+└── README.md
+```
+
+## Development Setup
+
+Some notes I took while setting this up for the first time: [Knoats](https://knoats.com/books/esp32/page/rust)
+
+[Espressif Rust book](https://docs.espressif.com/projects/rust/book/introduction.html)