Create CONTRIBUTING.md

CONTRIBUTING.md

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+# How to Contribute
+
+Thanks to the care taken to improve the developer experience in this project,
+contributing to Goober Bot can actually be quite easy!
+
+## Running Locally
+
+Before you can run the bot locally, you need to create and define a
+`Secrets.dev.toml` file in the root of the project. The contents of such a
+file should look like this:
+
+```toml
+DISCORD_TOKEN = ''
+GITHUB_PAT = ''
+```
+
+In between the single-quotes for `DISCORD_TOKEN`, you must provide a token for a
+bot to be piloted by the code. `GITHUB_PAT` is only used for `/sponsors`, so
+unless you intend to use that command with your locally running instance of the
+bot, you can just leave it blank.
+
+Next, you need to have Rust, Cargo, and `cargo-shuttle` installed. Follow the
+instructions [here](https://www.rust-lang.org/tools/install) to install Rust.
+Cargo is usually installed along with Rust. To install `cargo-shuttle`, run the
+following command:
+
+```sh
+cargo install cargo-shuttle@0.47.0
+```
+
+After setting all that up, you're ready to get going! Just run the following to
+start the bot:
+
+```sh
+cargo shuttle run
+```
+
+## Adding Silly Commands
+
+Commands like `/boop`, `/bap`, and `/meow`, are called "silly commands". They
+can all be found in `src/commands/silly.rs`. The `silly_command! {}` macro makes
+creating silly commands an absolute *breeze*. Check the documentation for this
+macro and/or look around the `silly.rs` file for examples.