Update api_response.ex w/ placeholders

lib/playwright/api_response.ex

@@ -9,8 +9,39 @@ defmodule Playwright.APIResponse do
   @property :status_text
   @property :url
 
+  # @spec body(t()) :: binary() # or, equivalent of `Buffer`
+  # def body(response)
+
+  # @spec dispose(t()) :: :ok
+  # def dispose(response)
+
+  # @spec headers(t()) :: map()
+  # def headers(response)
+
+  # @spec headers(t()) :: map()
+  # def headers(response)
+
+  # def headers_array...
+  # will not implement. if it's determined that the JS/OOP version provides
+  # something meaningful over what `headers` provides, we'll do it differently.
+
+  # @spec json(t()) :: binary() # "serializable"; so, maybe map()?
+  # def json(response)
+
   @spec ok(t()) :: boolean()
   def ok(%APIResponse{} = response) do
     response.status === 0 || (response.status >= 200 && response.status <= 299)
   end
+
+  # @spec status(t()) :: number()
+  # def status(response)
+
+  # @spec status_text(t()) :: binary()
+  # def status_text(response)
+
+  # @spec text(t()) :: binary()
+  # def text(response)
+
+  # @spec url(t()) :: binary()
+  # def url(response)
 end