Create README.md

Author: richarddd

README.md

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+# AWS Lambda API Gateway Servlet
+
+This util allows for mapping any HttpServletRequest and HttpServletResponse to and from API gateway classes
+
+## Installation
+TODO
+
+## Usage
+Example with javalin and aws lambda handler:
+```kotlin
+class HelloHandler : RequestHandler<APIGatewayProxyRequestEvent, APIGatewayProxyResponseEvent> {
+
+    companion object{
+        val app = Javalin.createStandalone()
+        app.get("/") { ctx -> ctx.result("Hello World") }
+    }
+
+    override fun handleRequest(input: APIGatewayProxyRequestEvent, context: Context) = app.servlet().serve(input)
+}
+
+```