See the documentation.

1. Get Ganache-cli

   npm install -g ganache-cli

2. Run this:

   ganache-cli -d -i 437894314312

3. Clone pm-contracts, cd in there, and migrate the contracts onto the Ganache-cli instance with:

   cd path/to/pm-contracts
   npm install
   npm run migrate

4. Download gnosis-pm.js and put it in an HTML file:

   <script src="gnosis-pm.js"></script>

5. Follow some tutorials:
   • API Overview
   • Events, Oracles, and Markets