added example

.devcontainer/Dockerfile

@@ -0,0 +1,8 @@
+FROM rust:1-bookworm
+RUN apt update && apt upgrade -y && apt install fish iputils-ping -y
+
+RUN useradd -ms /bin/fish vscode
+USER vscode
+RUN rustup target add wasm32-unknown-unknown
+RUN rustup component add rustfmt clippy
+RUN cargo install cargo-leptos