[esp] Add Rust no-std example.

esp/rust/03_no-std-lcd/README.md

@@ -0,0 +1,33 @@
+# 03_no-std-lcd
+
+This is an example of using ESP-IDF using no std.
+When flashed to a device, the application draws a message to the LCD screen.
+
+Steps used to generate this project
+
+```bash
+cargo install esp-generate
+esp-generate --chip esp32 esp-gen-no-std
+```
+
+You will also need to install [probe-rs](https://probe.rs/docs/getting-started/installation/)
+
+```bash
+curl --proto '=https' --tlsv1.2 -LsSf https://github.com/probe-rs/probe-rs/releases/latest/download/probe-rs-tools-installer.sh | sh
+```
+
+Steps to build and flash this project
+
+```bash
+# Install espflash if you don't have it already
+cargo install espflash
+
+# Export esp-idf build environment
+. ~/export-esp.sh
+
+# Build and flash to the device
+cargo build
+cargo run
+```
+
+For more detailed information on setting up a development environment, see [the esp/rust README](/esp/rust/README.md)