Add dev environment setup doc.

DEV_SETUP.md

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+
+# Setting up git
+
+First, you'll need to set up commit signing.
+
+
+`bash
+
+# install gpg on macos
+brew install gpg
+
+# Set git to sign all commits by default
+git config --global commit.gpgsign true
+
+# Find the verified email address for your GitHub account here:
+https://docs.github.com/en/account-and-profile/setting-up-and-managing-your-personal-account-on-github/managing-email-preferences/verifying-your-email-address
+
+# Create a new gpg key -- make sure to use you verified github email
+gpg --full-generate-key
+# https://docs.github.com/en/authentication/managing-commit-signature-verification/generating-a-new-gpg-key
+
+# Get the ID for your GPG secret key
+# In the example below, it is '3AA5C34371567BD2'
+
+$ gpg --list-secret-keys --keyid-format=long
+/Users/<you>/.gnupg/secring.gpg
+------------------------------------
+sec   4096R/3AA5C34371567BD2 2016-03-10 [expires: 2017-03-10]
+uid                          You <[email protected]>
+ssb   4096R/4BB6D45482678BE3 2016-03-10
+
+# Print the GPG public key in ASCII armor format
+gpg --armor --export <YOUR_ID e.g. 3AA5C34371567BD2>
+
+# Add your GPG signing key to your github account
+https://docs.github.com/en/authentication/managing-commit-signature-verification/adding-a-gpg-key-to-your-github-account#adding-a-gpg-key
+`
+
+# Setting up your development environment
+
+Now that you have git signing set up, let's set up the repo.
+
+## Check out the repo
+
+`bash
+$ cd
+$ git clone [email protected]:Chia-Network/chia-gaming.git
+$ cd chia-gaming
+`
+
+## Install Rust
+`
+brew install llvm maturin
+rustup toolchain install nightly
+rustup default nightly
+`
+
+## Check the build
+`cargo test
+`