docs: improve and reference contributing documentation (#73)

Brewfile

@@ -0,0 +1 @@
+brew "go"

CONTRIBUTING.md

@@ -1,8 +1,15 @@
 ## Setting up the environment
 
-### Install Go 1.18+
+To set up the repository, run:
 
-Install go by following relevant directions [here](https://go.dev/doc/install).
+```sh
+$ ./scripts/bootstrap
+$ ./scripts/build
+```
+
+This will install all the required dependencies and build the SDK.
+
+You can also [install go 1.18+ manually](https://go.dev/doc/install).
 
 ## Modifying/Adding code
 
@@ -14,7 +21,7 @@ modify the contents of the `lib/` and `examples/` directories.
 
 All files in the `examples/` directory are not modified by the generator and can be freely edited or added to.
 
-```bash
+```go
 # add an example to examples/<your-example>/main.go
 
 package main
@@ -24,36 +31,36 @@ func main() {
 }
 ```
 
-```bash
-go run ./examples/<your-example>
+```sh
+$ go run ./examples/<your-example>
 ```
 
 ## Using the repository from source
 
 To use a local version of this library from source in another project, edit the `go.mod` with a replace
 directive. This can be done through the CLI with the following:
 
-```bash
-go mod edit -replace github.com/openai/openai-go=/path/to/openai-go
+```sh
+$ go mod edit -replace github.com/openai/openai-go=/path/to/openai-go
 ```
 
 ## Running tests
 
 Most tests require you to [set up a mock server](https://github.com/stoplightio/prism) against the OpenAPI spec to run the tests.
 
-```bash
+```sh
 # you will need npm installed
-npx prism mock path/to/your/openapi.yml
+$ npx prism mock path/to/your/openapi.yml
 ```
 
-```bash
-go test ./...
+```sh
+$ ./scripts/test
 ```
 
 ## Formatting
 
 This library uses the standard gofmt code formatter:
 
-```bash
-gofmt -s -w .
+```sh
+$ ./scripts/format
 ```

README.md

@@ -657,3 +657,7 @@ This package generally follows [SemVer](https://semver.org/spec/v2.0.0.html) con
 We take backwards-compatibility seriously and work hard to ensure you can rely on a smooth upgrade experience.
 
 We are keen for your feedback; please open an [issue](https://www.github.com/openai/openai-go/issues) with questions, bugs, or suggestions.
+
+## Contributing
+
+See [the contributing documentation](./CONTRIBUTING.md).