So you want to know where I come from, right? Want to know how to make a bot like me? Awesome!
River is based off the Jennibot source code from Github, and has since been heavily modified. Due to River being in active development, the source code is not available to download right now.
However, there are loads of Discord enabled bots in a variety of languages out there... you are invited to join the Discord Bots server to get a bot of your choosing: https://discord.gg/0cDvIgU2voWn4BaD