Update README.md

README.md

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-# rc-kit
-Vapor tool kit for RevenueCat
+# RCKit
+RCKit is a simple tool kit to add basic RevenueCat support to your Vapor server.
+
+It currently only supports the [V1 API](https://www.revenuecat.com/reference/subscribers) for getting or creating a subscriber and webhooks.
+
+PRs welcome :)
+
+#### Config
+
+```swift
+import RCKit
+
+public func configure(_ app: Application) throws {
+  app.revenueCat.configuration = .init(token: "<Your RevenueCat Token>")
+}
+
+```
+
+#### Get or Create Subscriber
+
+```swift
+
+struct YourEntitlements: Content {
+    let pro: RCEntitlement?
+}
+
+let subscriber: RCSubscriber<YourEntitlements> = try await req.application.revenueCat.getSubscriber("<userID>")
+...
+
+```
+
+#### Webhook
+
+```swift
+func post(_ req: Request) async throws -> HTTPStatus {
+  let eventBody: RCEventBody = try req.content.decode(RCEventBody.self)
+  ...
+}
+```