adds blocking pwm working impl for the spinnyboy in rust based on the esp32c6

spinnyboy_rust/shell.nix

@@ -0,0 +1,19 @@
+{ pkgs ? import <nixpkgs> {}}:
+let rust-toolchain = with pkgs; symlinkJoin {
+    name = "rust-toolchain";
+    paths = [
+    probe-rs-tools
+    rustup
+    rustc
+      cargo
+      rustfmt
+      rust-analyzer
+      clippy
+      rustPlatform.rustcSrc
+    ];
+  };
+in pkgs.mkShell {
+  buildInputs = [rust-toolchain];
+  RUST_SRC_PATH = "${pkgs.rust.packages.stable.rustPlatform.rustLibSrc}";
+  RUST_BACKTRACE = 1;
+}