Various changes

readme.md

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+Wallas DT/GB Heater Controller on an ESP32C3
+============================================
+
+## Getting Started
+
+As described in the chapter on Risc-V target installation in the [Rust on ESP Book](https://docs.esp-rs.org/book/installation/riscv.html),
+you should install the ESP32c3 target for your rust toolchain by doing:
+
+```bash
+rustup toolchain install stable --component rust-src
+rustup target add riscv32imc-unknown-none-elf
+```
+
+It is advised to run the `--release` version of the application, thus to build and run, do:
+
+```bash
+cargo build --release
+cargo run --release
+```
+