feature: Adds swiftformat instructions to readme

Author: NeedleInAJayStack

README.md

@@ -97,8 +97,6 @@ To execute a subscription use the `graphqlSubscribe` function:
 ```swift
 let subscriptionResult = try graphqlSubscribe(
     schema: schema,
-    request: "{ hello }",
-    eventLoopGroup: eventLoopGroup
 ).wait()
 // Must downcast from EventStream to concrete type to use in 'for await' loop below
 let concurrentStream = subscriptionResult.stream! as! ConcurrentEventStream
@@ -131,6 +129,13 @@ Those contributing to this package are expected to follow the [Swift Code of Con
 [Swift API Design Guidelines](https://swift.org/documentation/api-design-guidelines/), and the
 [SSWG Technical Best Practices](https://github.com/swift-server/sswg/blob/main/process/incubation.md#technical-best-practices).
 
+This repo uses [SwiftFormat](https://github.com/nicklockwood/SwiftFormat), and includes lint checks to enforce these formatting standards.
+To format your code, install `swiftformat` and run:
+
+```bash
+swiftformat .
+```  
+
 Most of this repo mirrors the structure of
 (the canonical GraphQL implementation written in Javascript/Typescript)[https://github.com/graphql/graphql-js]. If there is any feature
 missing, looking at the original code and "translating" it to Swift works, most of the time. For example: