add github codespace cfg files

.devcontainer/Dockerfile

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+FROM ubuntu:18.04
+
+WORKDIR /home/
+
+COPY . .
+
+RUN bash ./setup.sh
+
+ENV PATH="/root/.cargo/bin:$PATH"

.devcontainer/devcontainer.json

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+{
+	"name": "RustWallet",
+	"dockerFile": "Dockerfile",
+	"settings": {
+		"editor.formatOnSave": true,
+		"terminal.integrated.shell.linux": "/usr/bin/zsh",
+		"files.exclude": {
+			"**/CODE_OF_CONDUCT.md": true,
+			"**/LICENSE": true
+		}
+	}
+}

.devcontainer/setup.sh

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+## update and install some things we should probably have
+apt-get update
+apt-get install -y \
+  curl \
+  git \
+  gnupg2 \
+  jq \
+  sudo \
+  zsh \
+  vim \
+  build-essential \
+  openssl
+
+## Install rustup and common components
+curl https://sh.rustup.rs -sSf | sh -s -- -y 
+rustup install nightly
+rustup component add rustfmt
+rustup component add rustfmt --toolchain nightly
+rustup component add clippy 
+rustup component add clippy --toolchain nightly
+
+cargo install cargo-expand
+cargo install cargo-edit
+cargo install cargo-ndk
+cargo install cargo-lipo
+rustup target add aarch64-linux-android armv7-linux-androideabi i686-linux-android x86_64-linux-android
+rustup target add aarch64-apple-ios x86_64-apple-ios
+
+curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
+
+
+## setup and install oh-my-zsh
+sh -c "$(curl -fsSL https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh)"
+cp -R /root/.oh-my-zsh /home/$USERNAME
+cp /root/.zshrc /home/$USERNAME
+sed -i -e "s/\/root\/.oh-my-zsh/\/home\/$USERNAME\/.oh-my-zsh/g" /home/$USERNAME/.zshrc
+chown -R $USER_UID:$USER_GID /home/$USERNAME/.oh-my-zsh /home/$USERNAME/.zshrc