add echo statements for each step in install script

.devcontainer/postCreateCommand.sh

@@ -1,15 +1,23 @@
 #!/bin/sh
+
+echo "Installing Rust and WASM toolchain..."
 curl https://sh.rustup.rs -sSf | sh -s -- -y
 rustup default stable
 rustup update
 rustup update nightly
 rustup target add wasm32-unknown-unknown --toolchain nightly
+
+echo "Installing protoc..."
 sudo apt update
 sudo apt install -y unzip
 PROTOC_VERSION=$(curl -s "https://api.github.com/repos/protocolbuffers/protobuf/releases/latest" | grep -Po '"tag_name": "v\K[0-9.]+')
 curl -Lo protoc.zip "https://github.com/protocolbuffers/protobuf/releases/latest/download/protoc-${PROTOC_VERSION}-linux-x86_64.zip"
 sudo unzip -q protoc.zip bin/protoc -d /usr/local
 sudo chmod a+x /usr/local/bin/protoc
 rm -rf protoc.zip
+
+echo "Building Substrate Node Template..."
 cargo build --release --locked
+
+echo "Installing cargo-contract CLI tool..."
 cargo install --force --locked cargo-contract --version 2.0.0-rc